Mishra's Foundry + Prototype cards
The game took all ability to keep playing (can't advance turns, go to combat, play any card or tap for mana) after I tried to cast a prototype card (combat thresher). The only difference before my previous games was that I was using a Mishra's foundry.
The game even went to spend one of my hourglass times, but it didn't move on to the opponent's turn after the timer ran out, it stayed there unresponsive
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