Deck Formats

Deck size and sideboard limits, per the Comprehensive Rules effective August 7, 2026. Card legality and banned/restricted lists are separate from the sizes below.

Constructed

Format	Deck size	Minimum	Maximum	Sideboard	Sideboard max
Standard	—	60	none	Yes	15
Pioneer	—	60	none	Yes	15
Modern	—	60	none	Yes	15
Legacy	—	60	none	Yes	15
Vintage	—	60	none	Yes	15
Pauper	—	60	none	Yes	15

Commander

Format	Deck size	Minimum	Maximum	Sideboard
Commander / EDH singleton	100	100	100	No
cEDH singleton	100	100	100	No
Brawl singleton	60	60	60	No
Commander Draft *	—	60	none	No

Limited

Format	Deck size	Minimum	Maximum	Sideboard	Sideboard max
Draft	—	40	none	Yes	Remaining card pool
Sealed	—	40	none	Yes	Remaining card pool

Digital

Format	Deck size	Minimum	Maximum	Sideboard	Sideboard max
Historic *	—	60	none	Yes	15
Timeless *	—	60	none	Yes	15
Alchemy *	—	60	none	Yes	15

Magic Online

Format	Deck size	Minimum	Maximum	Sideboard	Sideboard max
Freeform (MTGO)	—	40	none	Yes	Format-specific
Momir Basic (MTGO)	60 basic lands + Momir Vig Vanguard	60	60	No	0

Footnotes

Arena's Best-of-One and Best-of-Three queues change how sideboards are used in practice — check the event or queue rules when validating a specific deck.

Commander Draft follows the Commander rules framework, which establishes no sideboard. Unlike ordinary Draft, leftover drafted cards are not a sideboard.

Where these come from

Rule	What it establishes
100.2a	Constructed decks have a minimum deck size of 60 cards.
100.2b	Limited decks have a minimum deck size of 40 cards.
100.4a	A constructed sideboard may contain no more than 15 cards.
100.4b	In individual Limited play, every card in a player's pool not in the main deck is part of their sideboard — so Limited sideboards are not capped at 15.
100.5	There is no maximum deck size for non-Commander decks.
903	Commander: exactly 100 cards including the commander, singleton, no sideboard.
903.12	Brawl: exactly 60 cards including the commander.
903.13	Commander Draft: 60 card minimum, no maximum.

A practical tournament deck still needs to be physically shufflable.