TLDR
- A 360-card cube supports a traditional eight-player draft with three 15-card packs per player.
- Choose the draft experience before choosing individual cards.
- Build archetypes with overlapping cards instead of narrow cards that only work in one deck.
- Give aggressive decks enough cheap threats, control decks enough interaction, and every color enough playable cards at each point on the mana curve.
- An MTG proxy cube lets you test the full environment before spending money on expensive cards.
- Use consistent card dimensions, opaque sleeves, clear proxy markings, and matching print quality across the cube.
A cube can contain every card you love and still produce miserable drafts.
That is the difficult part. Building an MTG proxy cube is not mainly about assembling a stack of powerful Magic cards. It is about designing a draft environment where players can recognize strategies, make meaningful choices, and build decks that function.
A good cube gives players options. A bad cube gives them six uncastable gold cards, three seven-drops, and the growing suspicion that basic lands were the correct first picks.
Proxying the cube makes the design process much easier. You can build the entire card pool, draft it several times, replace weak cards, and adjust archetypes before deciding which cards are worth buying.
What Is an MTG Proxy Cube?
An MTG cube is a curated collection of cards used to create repeatable drafts. Instead of opening retail booster packs, the cube owner shuffles the cube and creates custom packs from its card pool.
An MTG proxy cube uses clearly identified proxy or playtest cards for some or all of that collection. The cards may represent expensive staples, older cards, alternate artwork, custom designs, or cards the owner wants to test before buying.
The basic drafting process normally looks like this:
- Shuffle the cube.
- Create three 15-card packs for each player.
- Draft the packs as you would in a normal Booster Draft.
- Build 40-card decks.
- Provide basic lands separately.
- Play matches and take notes about the environment.
Many cubes use one copy of each card, which is called singleton design. But singleton is a convention, not a requirement. A set cube may use several copies of important commons and uncommons. A tribal cube may repeat essential creatures. A custom environment may duplicate cards that hold an archetype together.
The cube belongs to you. The important question is not whether it follows an unwritten rule. It is whether it produces good drafts.
Choose the Right Cube Size
For a traditional eight-player draft, 360 cards is the cleanest starting size. Eight players drafting three 15-card packs will use exactly 360 cards, so every card in the cube appears during the draft. Wizards of the Coast has also recommended 360 cards as a practical size for a first cube.
Larger cubes add variety because not every card appears in every draft. That can make repeat sessions feel different, but it also makes narrow combinations less reliable.
| Cube Size | Typical Use | Main Tradeoff |
|---|---|---|
| 180 cards | Small groups and two-to-four-player formats | Easy to manage, but limited variety |
| 360 cards | Traditional eight-player drafts | Every card appears in a full draft |
| 450 cards | Eight-player drafts with moderate variation | Some cards stay out each session |
| 540 cards | Larger groups or highly replayable cubes | Better variety, less reliable synergy |
| 720 cards | Large collections and broad environments | Harder to balance and maintain |
For a first MTG proxy cube, I would start with 360 cards.
A 360-card cube is large enough to support a full pod but small enough that you can understand what is happening. When an archetype fails, you have fewer cards to inspect. When one color dominates, the imbalance is easier to find.
You can always expand later. Cutting a bloated 720-card cube back to 360 is much less pleasant. Cube owners form emotional attachments to cards with alarming speed.
Decide What Kind of Draft You Want
Do not start by listing your favorite cards. Start by defining the experience.
Ask a few basic questions:
- Should games feel fast or slow?
- Should decks rely on synergy or individually powerful cards?
- How difficult should the draft be for newer players?
- Should combos be common, rare, or absent?
- How strong should removal be?
- How many colors should a normal deck play?
- Should the environment resemble a retail set, Commander, or high-powered Vintage Cube?
This decision shapes everything else.
Powered Cube
A powered cube uses some of the strongest cards in Magic. Fast mana, efficient interaction, and powerful combinations create explosive games. These cubes can be exciting, but they are difficult to balance and may punish players who do not recognize important picks.
Unpowered Cube
An unpowered cube leaves out the most extreme cards while still using strong options from across Magic. This often produces a broader range of viable decks and fewer games decided by one early piece of fast mana.
Peasant or Pauper Cube
A Peasant Cube normally uses commons and uncommons. A Pauper Cube uses commons. These formats can produce excellent games because efficient creatures, removal, combat tricks, and card advantage matter more than expensive mythics.
Set Cube
A set cube recreates the draft environment of a specific Magic release. Unlike a typical singleton cube, a set cube often contains multiple copies of commons and fewer copies of higher-rarity cards.
Commander Cube
A Commander Cube adapts drafting around legendary creatures, color identity, multiplayer games, and Commander deck construction. These cubes usually need special drafting rules because a normal 45-card draft pool is not enough to build a 100-card Commander deck.
For a first build, choose one clear identity. “Cards I own and cards I think are cool” is a collection. It is not yet a draft environment.
Build a 360-Card Cube Skeleton
Once you know what the cube should feel like, divide the available space into broad sections.
Here is one reasonable starting structure for a balanced 360-card cube:
| Section | Cards |
|---|---|
| White | 50 |
| Blue | 50 |
| Black | 50 |
| Red | 50 |
| Green | 50 |
| Multicolor | 30 |
| Nonbasic lands | 45 |
| Colorless cards and artifacts | 35 |
| Total | 360 |
These numbers are not universal. They are a starting point.
A multicolor-heavy cube may use more gold cards. An artifact cube may devote far more space to colorless cards. A mono-color-focused environment may reduce both sections.
But you should be careful with multicolor cards. They look appealing during cube construction because they clearly express an archetype. During a draft, they have fewer possible homes.
A strong mono-color card might fit three or four decks. A white-black card normally fits one color pair. If the cube contains too many gold cards, players will see more picks they cannot use.
For a first cube, keep the gold section relatively controlled and let mono-color cards carry most of the archetype support.
Design Cube Archetypes With Overlap
Many cube builders assign one archetype to each two-color pair. That is a useful framework, but it can become too rigid.
A sample archetype map might look like this:
| Color Pair | Possible Archetype |
|---|---|
| White-Blue | Blink or control |
| Blue-Black | Reanimator or tempo |
| Black-Red | Sacrifice |
| Red-Green | Ramp or monsters |
| Green-White | Tokens or counters |
| White-Black | Attrition |
| Blue-Red | Spells |
| Black-Green | Graveyard value |
| Red-White | Aggro or equipment |
| Green-Blue | Ramp or card advantage |
The mistake is treating each archetype as a sealed room.
Suppose the red-black section supports sacrifice. A good sacrifice card might also work in black-green graveyard decks, white-black token decks, or red-white aggressive decks. That card creates choices during the draft.
A narrow card that only works when the player assembles three other specific pieces creates fewer choices. It either belongs in one exact deck or sits in the sideboard.
Look for cards that perform several jobs:
- Creatures that create more than one body
- Discard outlets that also provide card selection
- Artifacts that support both sacrifice and graveyard decks
- Removal spells with optional utility
- Creatures that work in aggressive and midrange decks
- Lands that support several color combinations
- Combat tricks that can also protect a creature
- Reanimation targets that remain castable in a normal game
This is sometimes called archetype overlap. It makes the cube feel connected rather than divided into ten prebuilt decks that players must discover.
Get the Mana Curve Right
Cube lists tend to become expensive at the top of the mana curve.
Five-mana dragons are memorable. Two-mana creatures that hold the draft together are less exciting during construction. Unfortunately, players need the second group much more often.
Sort every color by mana value and inspect the curve.
Aggressive colors need enough one-mana and two-mana threats to build a real aggressive deck. It is not enough to include six famous aggressive cards and hope the rest works itself out.
Control and midrange decks also need early plays. Cheap removal, defensive creatures, card selection, mana acceleration, and flexible interaction prevent those decks from spending the first three turns watching the opponent play Magic.
A healthy cube should include:
- One-mana plays where the environment needs them
- A strong supply of two-mana cards
- Enough three-mana cards to bridge early and late turns
- Fewer four-mana cards than most first drafts contain
- A limited number of expensive finishers
- Cards that can be cast in more than one stage of the game
Modal cards, cycling cards, split cards, kicker spells, and creatures with useful activated abilities can help smooth the curve. They reduce the number of cards that are only useful under one exact condition.
Add Enough Interaction
Games become repetitive when players cannot answer important threats.
Each color does not need identical removal, but every supported deck should have ways to participate when the opponent develops a strong board.
Interaction may include:
- Creature removal
- Counterspells
- Artifact and enchantment removal
- Graveyard disruption
- Combat tricks
- Bounce spells
- Discard
- Board wipes
- Protective spells
- Flexible creatures with removal abilities
The quality of removal should match the quality of threats.
If creatures are efficient but removal is slow and narrow, aggressive decks may dominate. If removal is extremely cheap and plentiful, creature-based synergy decks may never keep anything on the battlefield.
And do not place every answer in the sideboard portion of the draft. Main-deck flexibility matters. A card that can destroy an artifact or perform another useful job is much easier to draft than a card that does nothing unless the opponent happens to control the correct permanent type.
Treat Mana Fixing as Part of the Design
Mana fixing determines which decks are realistic.
Too little fixing makes multicolor cards difficult to use. Too much fixing can turn the cube into five-color good-stuff decks where players ignore the intended archetypes and collect the strongest card from every pack.
For a 360-card cube, around 40 to 50 nonbasic lands is a reasonable starting range. The correct number depends on how many gold cards you include and how easily you want players to splash additional colors.
You can use:
- Dual-land cycles
- Fetchable lands
- Five-color lands
- Utility lands
- Colorless fixing artifacts
- Green mana acceleration
- Lands connected to specific archetypes
Try to distribute fixing fairly. Supporting one color pair with five strong dual lands while another pair receives two tapped lands and a hopeful expression will affect draft results.
Land cycles do not have to be perfectly symmetrical, but any imbalance should be intentional.
Use Proxies to Test Before You Commit
An MTG proxy cube is useful because cube design is never truly finished.
Some cards that look essential will go late in every draft. Others will appear in nearly every winning deck. An archetype may need one more cheap enabler. A powerful build-around card may be impressive but too difficult to support.
Proxy the first complete version and test it.
This is often better than buying the cube in stages. A half-finished cube cannot tell you much about the final environment because the missing cards change draft signals, curves, fixing, and archetype density.
The existing guide to budget MTG cube staples is a useful companion when filling the less glamorous but essential roles. Removal, fixing, card draw, and cheap creatures usually improve a cube more than another expensive finisher.
Keep the Physical Cube Consistent
Hidden cards should not be identifiable by touch, thickness, size, curl, sleeve fit, or card back.
That means consistency matters more than making any single proxy resemble an authentic card.
Use:
- One opaque sleeve style throughout the cube
- Consistent card dimensions
- Similar card thickness
- Matching corner shapes
- Clear print quality
- Readable rules text
- Clearly marked proxy backs or disclosures
- The same construction method for all home-printed inserts
BootlegMTG’s guide to MTG proxy card size and printing specifications explains common card dimensions, sleeve sizes, bleed, resolution, and cardstock considerations in more detail.
If some cards are professionally printed while others are paper inserts, opaque sleeves may hide the backs but not necessarily the difference in thickness. Check the sleeved cube before drafting.
Shuffle several piles. Cut the deck. Feel the edges. Ask another player whether any cards stand out while face down.
A marked card does not become less marked because the difference was accidental.
Test the Cube in Small, Focused Steps
Do not change 40 cards after one draft.
A single draft produces useful observations, but it does not prove that an archetype is broken. The cards may have been distributed badly. A key player may have switched colors halfway through. The strongest drafter may simply have opened every removal spell and interpreted that event as destiny.
After each draft, record:
- Which archetypes were drafted
- Which cards were picked unusually early or late
- Which cards remained in sideboards
- Which decks struggled to cast their spells
- Which color combinations were missing
- Which cards created poor gameplay
- Which games ended before one player could meaningfully respond
- Which cards players enjoyed
Then change a small number of cards.
Replacing five to ten cards at a time makes it easier to understand the result. Large changes may improve the cube, but you will not know which decisions helped.
Digital cube tools such as Cube Cobra can also help you sort cards, track changes, examine color balance, and run sample drafts before the physical cards arrive.
Common MTG Proxy Cube Mistakes
Including Too Many Expensive Cards
A cube does not become better because its theoretical market value increases. Expensive cards can be strong, nostalgic, scarce, or visually distinctive. None of those qualities automatically makes them good for your environment.
Ignoring Aggro
Aggressive decks require density. Include enough cheap threats, efficient interaction, and ways to finish games. Three one-drops and a Lightning Bolt do not constitute red-white aggro.
Building Ten Isolated Archetypes
Players should be able to change direction during a draft. Cards with only one possible home create rigid packs and dead picks.
Using Too Many Gold Cards
Gold cards communicate themes clearly, but they are difficult to draft. Use them as signposts and rewards rather than the entire foundation of each archetype.
Forgetting Tokens and Accessories
Prepare the tokens your cards regularly create. Include dice, counters, emblems, and reminder cards when necessary. Asking the same Treasure token to represent a Clue, a Food, and three Goblins eventually becomes a memory game nobody requested.
Making Changes Without Notes
Cube design becomes much easier when you keep a change log. Record what left, what entered, and why. Otherwise, you may reintroduce the same failed card six months later because it once again looks excellent in a list.
Final Thoughts
The best MTG proxy cube is not the one with the most expensive cards. It is the one your group wants to draft again.
Start with 360 cards. Define the power level and play style. Create overlapping archetypes. Protect the mana curve. Include enough fixing and interaction. Then print the full cube and test it before treating any card choice as permanent.
You will make cuts. You will rebuild sections. A card you considered essential will spend three drafts circling the table like unwanted office cake.
That is normal.
Cube design improves through play. Proxies simply let you reach that part faster, with less expense and fewer regrets hiding in a binder.
FAQs
How Many Cards Should an MTG Proxy Cube Have?
A 360-card cube is the best starting point for a traditional eight-player draft. Smaller cubes can work for fewer players, while 450-card and 540-card cubes provide more variation between drafts.
Does an MTG Cube Have to Be Singleton?
No. Singleton is common, but it is not required. Set cubes, tribal cubes, and synergy-heavy environments may use multiple copies of important cards.
How Many Lands Should Be in a 360-Card Cube?
Around 40 to 50 nonbasic lands is a useful starting range. Increase the number when the cube includes many multicolor cards or encourages players to draft three or more colors.
Should Basic Lands Be Included in the Cube List?
Basic lands are normally stored separately and added after the draft. Keep enough sleeved basics available for every player and use the same sleeve style as the drafted cards.
Can I Mix Proxies and Authentic Cards in a Cube?
Yes, but the cards should be indistinguishable while face down. Use opaque sleeves and check for differences in size, thickness, curl, texture, and sleeve fit.
What Is the Best Tool for Managing an MTG Cube List?
Cube Cobra is one of the most useful tools for organizing cube lists, tracking changes, viewing card statistics, and running test drafts.
References
- Wizards of the Coast, Building Your First Cube.
- Wizards of the Coast, Casual Formats: Cube Draft.
- Cube Cobra, An Introduction to Cube Building.
- Cube Cobra, Cube Construction for Beginners in 10 Steps.
- Riptide Lab, Building Your First Cube.
- BootlegMTG, Budget MTG Cube Staples: The Cards That Carry Draft Environments.
- BootlegMTG, MTG Proxy Card Size, Thickness, and Printing Specifications.