Take out a loan against your home: summon a rook on any empty square. The bank keeps the deed, so you can never castle again for the rest of the game.
You draft Mortgage in Buff mode. Activated: you choose when to use it, and using it is your move for that turn.
As a pieces card, it summons, revives, promotes, or converts a piece.
“Sold, to the player in a hurry.”