Antihydra in Magic: The Gathering Updated +Created
It is known that Magic: The Gathering is Turing complete, but it is cool to have a concrete specific example of an open problem in mathematics coded in it.
Figure 1.
Screenshot of the Antihydra in Magic: The Gathering construction
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Magic: The Gathering is Turing complete Updated +Created
Video 1.
I Built a COMPUTER in Magic: The Gathering by Because Science (2019)
Source. Shows an explicit Turing complete Magic The Gathering setup with real cards in a standard "extremely lucky" 2 player game.