Mono coloured legendary creatures have partner.
Only cards from commander's colour identity allowed in final deck.
Every deck gets a Command Tower and an Arcane Signet

Draft (up to 8):
4 packs of 16 cards
64 card pool (512 total)
Pick 2 cards per round

Sealed:
Max 6 players
6x 16 card packs
96 card pool (576 total)

Build a 60 card deck (including commanders)