Magic: the Gathering Is Turing Complete
TsukiKage writes "A 50-card M:tG combo for four players is demonstrated that is used to construct a simple Turing machine, performing arbitrary computations just by following the rules of Magic and card text thereafter."
MTG is cool and all....but it's also one of the filthiest money making schemes around. If the cards were freely available, it would take most of the venom out of peoples sails.