Deckbuilding
Building the 100
Exactly 100 cards, one of everything, all inside your commander’s color identity.
Deck construction rules
- Exactly 100 cards including your commander — not a 100-card minimum.
- Singleton: one copy of every card except basic lands (and cards that explicitly break the rule, like Relentless Rats).
- Every card must fit your commander’s color identity. A colorless commander restricts you to colorless cards and lands without off-color identity.
- Your commander must be a legendary creature, or a card that explicitly says it can be your commander.
Lands have identity too
Color identity applies to lands. A deck with a mono-white commander cannot run a land with a black mana symbol in its rules text — basic land types in particular can smuggle identity onto unexpected cards.