The Queen of Hearts

When an opponent loses the game, if The Queen of Hearts is face down turn it face up and choose one—

• The current King becomes your teammate and for as long as The Queen of Hearts is face up, it has "When the King wins or loses the game, you also win or lose the game with that player."

•For as long as The Queen of Hearts is face up you and your permanents gain protection from the king.

Off with their heads!!!