We used to play with baseball cards, later within certain groups, Magic cards became the rage, then there were the Irak-Most-Wanted cards to see if the person you just shot was worth some money...
Iraq's Most Wanted Playing cards
Iraq's Most Wanted Playing cards
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Magic the Gathering cards
... and now there are Theory Trading Cards.I can see it now: "I'll trade you two Foucaults and a Weber for your bell hooks."
Or perhaps it could be a card game:
"I use my Marx to raise class consciousness and incite a workers revolt causing you 10 points of damage!"
"Wait a second! I use my postmodernists to convince the workers that there are no more metanarratives and they each need to find their own identities and accept the differences that exist between each person. I take no damage and you can not use your Marx card for three more turns!"