Cheatin!
Reaction: Play when another player reveals an illegal Draw hand. That player must select and discard one of his cards in play. Then, that hand is discarded without effect and the player must draw 5 new cards for his or her Draw hand. That player must continue discarding cards and redrawing until he reveals a legal Draw hand or he has no cards in play. Only one Cheatin' card can be played against a player per draw.