Each player brings 3 decks but no sideboard. The decks must be of different Orders. Each match, the players ban one of their opponent’s decks – deciding only from the hero (they may not look through the decks). In a Swiss or Single Elimination structure, decide randomly who bans first. In a knock-out stage, the greatest seed chooses who bans first. Whoever bans first also chooses whether or not they go first (it then alternates each game within a match).
After decks have been banned, the players secretly decide which deck to play first, revealing it to their opponent before the game begins. A player must win with both remaining decks to win the match; they can’t win twice with the same deck.