Each Gwent deck is built with one Leader card. Leader cards determine the deck's faction and start the game in-play. They are unaffected by other cards; depending on the specific Leader card, they may contribute to a player's total strength. Each Leader comes equipped with a powerful ability for turning the tide of battle.
Leader cards may only be used once per match; using a Leader card is the same as using a regular card, and the player's turn will end.