The War Deck is created outside an active game and contains what Terrain, Encounter, Spell, and Ambush cards the player plans to use in-game.
War Decks have a size limit based on the length of the game being played:
- short games are limited to 60 cards
- medium length games are 80 cards
- long games are 100 cards
All decks must have a minimum of 45 cards. Players can make any number of decks and reuse cards between decks, so long as the number of a specific card used in a deck doesn't go over the total number the player actually owns.