Munchkin Cows expansion. Cows? Yes, Cows. Haven't you herd? Here's the latest 15-card set of monsters and Treasures for any Munchkin game. Steak your claim to this expansion before it's gone, because you'll veal sad if you miss it . . . and that's no bull. This is an expansion for Munchkin. It is not a stand-alone game. These cards originally appeared in Munchkin Unicorns and Friends.