Publisher's Description (from website)
In this season of goodwill to all, we're proud to present the Munchkin 2009 Christmas Card. You can give it to your friends . . . or keep it for yourself (in the true Munchkin holiday spirit) to use the new rule in any Munchkin game!
Munchkin Santa Trap Holiday Card Rule
Once per game, if you have a Munchkin Santa Trap Holiday Card on the table, you may take one face-up Monster into your hand, rather than fighting it, as a gift from Steve Jackson Games. Any cards played to help that monster are returned to their owners. Limit one Holiday Card per player.