In Martian Fluxx, the players are invaders from Mars, and the Creepers are those pesky Pathetic Humans who are always getting in our way, keeping us from winning. Cows of course are Keepers because for Humans and Martians alike, they're good eating. There are actually two Cow Keepers in the game; if you have them both you can win with the Goal "Two All-Beef Earthlings."
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