Is Magic: the Gathering Turing complete? A very specific question, I'm aware, and I doubt it will be answered by anyone that isn't already familiar with the rules of Magic. Cross-posted to Draw3Cards. Here are the comprehensive rules for the game Magic: the Gathering. See this question for a list of all Magic Cards. My question is - is the game Turing Complete?

For more details, please see the post at Draw3Cards.
Alex Churchill (@AlexC) has posted a solution that does not require cooperation between the players, but rather models the complete execution of a universal Turing machine with two states and 18 tape symbols.  For details, see  https://www.toothycat.net/~hologram/Turing/ [archive].