You and your opponent are each dealt a hidden card, ace low king high. Higher card wins: the winner steals a random enemy pawn, which walks across and defects. A tie splits the pot and nothing happens.
You draft River Card in Buff mode. Activated: you choose when to use it, and using it is your move for that turn.
As a attack card, it removes or detonates a piece directly.
“The river forgives nothing.”