You make up a 3-card hand (0 cards in deck) and try to beat the ones your opponents make up, both on the draw and on the play. The top decks get 1 card banned from them. Drawing from an empty library doesn’t lose the game, and randomness is always worst for the owner of the card (your mana crypt always deals 3 damage to you, if you donate it, it’ll deal 0 to your opponent). that is the entire format, and it’s super fun!