This post helps MTG cube builders choose the right cube size by explaining the tradeoffs of the most common sizes, so your drafts feel consistent, replayable, and actually work with your usual player count.
TLDR
- Our recommendation for the “perfect MTG cube size” is 360 cards for most groups. It’s the cleanest, tightest draft experience, and it’s the easiest size to build and maintain.
- Go 450 if you draft often with the same crew and your 360 is starting to feel “solved.”
- Go 540 if you want maximum variety for 8-player drafts (the MTGO-style experience), or you sometimes run bigger pods.
- Go 720 if you regularly want two separate 8-player drafts without rebuilding packs in between, or you have a truly large group.
The “perfect MTG cube size” is mostly math (and a little psychology)
Cube size debates get heated because everyone is arguing from their own lived experience. One person drafts weekly with the same eight degenerates who can smell an archetype from three seats away. Another person hosts “cube night” twice a year and half the table is still reading their cards like it’s a surprise.
So let’s ground this in one simple rule:
The only cube size rule you actually need
Most cubes assume 45 cards per player in a draft (three 15-card packs).
So the number of cards you “use” in a draft is:
Players × 45 = Cards opened
Everything else is just how much variance you want to inject by leaving some of the cube in the box.
Here’s what an 8-player draft looks like at common sizes:
- 360 cube: 360 cards opened (100% of the cube)
- 450 cube: 360 opened (80% of the cube)
- 540 cube: 360 opened (about 67% of the cube)
- 720 cube: 360 opened (50% of the cube)
That “cards left out” percentage is the whole vibe.
- Less left out = more consistency, easier to draft supported archetypes, less “where did my payoffs go?”
- More left out = more replayability, but also more “cool cool, my build-around is missing and now I’m drafting Honest Midrange Pile #47.”
Check out this hundred dollar cube.
Our recommendation: 360 cards is the perfect default
If you asked us for a single answer, this is it:
Build a 360-card cube first.
Not because it’s trendy. Not because it’s “the only correct way.”
Because it is the size where:
- The draft environment is tight and learnable
- Every card shows up in an 8-player draft
- Archetypes fire more often without needing a ton of redundancy
- Updating the cube is actually manageable (you can swap 10 cards without starting a second job)
A 360 cube is also weirdly flexible. Even if you don’t always have eight players, it still works great:
- 4 players: you open 180 cards, so you see half the cube
- 6 players: you open 270 cards, so you see 75% of the cube
That’s already plenty of variety for most real-life cube nights, and you still keep the environment coherent.
If your goal is “a cube that feels great every time,” 360 is hard to beat.
The honest comparison table
| Cube size | Best for | What you get | What you give up |
|---|---|---|---|
| 360 | Most playgroups, first cubes, tight archetypes | Maximum consistency, easier balance, less dilution | Less built-in variety if you draft it constantly with the same group |
| 450 | Frequent drafters who want a little more spice | More room for pet cards, extra archetypes, more replay | Slightly more variance, archetypes may need more redundancy |
| 540 | MTGO-style variety, big groups, “lots of drafts” cubes | High replayability, wider card pool, room for overlap | More “missing pieces” drafts, harder to balance, more upkeep |
| 720 | Two 8-player drafts back-to-back, very large groups | Massive variety, fewer repeats across drafts | Hardest to curate, most variance, archetypes can get washed out |
When you should choose 450
450 is the “I like my cube, I just want more room” size.
Pick 450 if:
- You draft often (monthly or more) with the same players
- Your 360 feels predictable
- You want to add support cards without cutting your favorites
- You want a little variance, but not “half my cube stayed home today” variance
450 also tends to feel like a natural expansion because it’s not a philosophical shift. It’s still a tight environment, just with a slightly larger bench.
When you should choose 540
540 is the “variety first” cube size.
It’s popular because it creates that experience where:
- Not every draft looks the same
- You do not always see every key card
- The meta doesn’t settle as quickly
That’s great if your cube gets drafted a lot, or if you love the feeling of discovery.
Pick 540 if:
- You regularly fire 8-player drafts
- You care about replayability more than archetype reliability
- You want room for more themes, more overlap, more “good cards that are also synergy cards”
- You sometimes draft with bigger groups (or split into two 6-player pods)
The tradeoff is real: at 540, you leave a full third of the cube out in an 8-player draft. If your archetypes are fragile, they will occasionally fail. You can reduce that by adding redundancy, but redundancy also eats space you could have used for variety. Welcome to cube design.
When you should choose 720
720 is not “better.” It’s “bigger.” Sometimes that’s exactly what you need.
Pick 720 if:
- You want to run two 8-player drafts without rebuilding packs
- You regularly have large groups and need the capacity
- You like high variance environments where players draft more “good stuff” and less scripted archetypes
But be honest with yourself: 720 is a maintenance commitment. If you love curating and tuning, great. If you want something that drafts well without constant tinkering, 720 can feel like babysitting a very expensive pet.
A simple decision framework (steal this)
Answer these five questions and your cube size basically picks itself:
- How many players do you actually draft with most often?
- Usually 6-8: start 360
- Often 8 and you draft a lot: consider 450 or 540
- Often 10+: 540 or 720
- How often does this cube get drafted?
- A few times a year: 360 stays fresh
- Monthly or more: 450/540 starts to make sense
- Do you want archetypes to “always show up,” or do you like uncertainty?
- Reliability: 360
- Variety and chaos: 540+
- Do you enjoy maintaining a cube as a hobby?
- Not really: 360
- Yes, I crave spreadsheets: 540/720
- Do you want one pod, two pods, or multiple formats (draft, sealed, etc.)?
- One pod: 360-540
- Multiple pods or mixed formats: 720 starts looking reasonable
Quick note if you’re proxying a cube
If you’re building a cube with proxies (which is extremely normal), pick your size first, then print it in one consistent batch so it all shuffles the same and doesn’t turn into “these 40 cards feel different for mysterious reasons.”
If you want help building custom versions of cards for your cube (alt art, custom frames, themed basics, that one card your group keeps arguing about), Proxy Foundry’s card tools can handle the layout part, which is usually where fun goes to die:
- MTG Card Creator
- And if you’re printing for a specific cube night deadline, plan around production and shipping: Shipping & Turnaround
FAQs
Is 360 cards enough for an MTG cube?
Yes. 360 supports an 8-player draft with three 15-card packs each (45 cards per player), and it’s widely recommended as the best starting point.
Why do so many people run 540-card cubes?
Because leaving a chunk of the cube out each draft increases replayability. 540 also gives you more room for archetypes and pet cards, at the cost of higher variance.
Is 450 a “real” cube size or just internet math?
It’s real. Lots of cube builders use 450 as a sweet spot between the tightness of 360 and the variance of 540.
Should my cube size be divisible by 90?
It helps, because 90 cards equals two players’ worth of packs (2 × 45). Sizes like 360, 450, 540, 630, and 720 play nicely with common pod sizes.
When should I upgrade from 360 to something bigger?
When your group drafts often enough that the environment feels predictable, or when you keep wanting to add archetypes and cards without cutting things you still enjoy.