A type of card that allows each player a bonus Order for the first round.
Strategems are non-interactable (they cannot be removed by your opponent) Order cards that are selected during deckbuilding, and start a Gwent game on the board if you go first. Otherwise, they make no appearance in the game by default. Each deck has exactly one stratagem, which will remain on the board until it is used. Each has a different effect that works with different kinds of deck. There are a number of neutral stratagems, as well as one built specifically for each faction.
Stratagems were introduced in the Merchants of Ofir expansion, building on Tactical Advantage, which existed previously.