Data wizardry for Magic: The Gathering
Finish the cube you started in your head.
Data-driven help for all of Magic, starting with cube. Paste the cards you own, get a cube that fits together, and see why. Free, no sign-up.
Learned from real cubes
Nearly two hundred thousand of them, built and shared by real players. That's how it knows which cards belong together and what a cube needs to play well.
Every pick has a reason
No scores, no black box. Each suggested card tells you in plain words what role it fills, what it plays with from your pool, and how common it is.
Built from what you own
Point it at your bulk and it stays inside it. What you get is a cube you can sleeve up tonight.
The Cube tool
Coming soonPaste your bulk. It builds the cube a few different ways, keeps what holds up, and gives you the reason for every pick.
There's a cube in your bulk box.
Sample · real output from an early build · 2026-07-05 · not the live tool yet
Your cube
Build 3 of 8 · 360 cards
- {X}{R}Balduvian RageInstantuncommon pick
- {R}Blazing RootwallaCreaturestaple
- {R}Burst LightningInstantstaple
- {R}Faithless LootingSorcerystaple
- {R}Flameblade AdeptCreaturestaple
- {R}Galvanic BlastInstantstaple
- {R}Kavaron HarrierArtifact Creaturestaple
- {R}Lightning AxeInstantstaple
- {R}Monastery SwiftspearCreaturestaple
…and the other colours below, in the real thing.
Lightning Axe
{R}Instant
Why this card?
- Plays well with Fiery Temper and Faithless Looting from the sample pool.
- Softer synergy with Terramorphic Expanse and Deep Analysis.
- A steady pick. It showed up in most builds we tried.6/8 builds
- A proven staple, in 6% of the cubes we've indexed.
Art: Dan Murayama Scott · card image via Scryfall
Shown with colour balance on, a setting the tool ships with.
How this was made
It learned from nearly two hundred thousand real cubes that players built and shared. For yours, it builds the cube 8 different times from the same cards. The picks that keep earning their place are the ones you see.
These are the tool's screens under construction. The cube and its reasons are real output from an early build, on a sample pool. When it opens, this is what you get: your cube, your reasons, ready for the table.