When playing Arcane Adaptation, a previously fast one player game will crawl to a stop. In a game with numerous triggers, the game has crashed.
I have included an instance of the game slowing to a stop, as I can easily recreate the effect in a solitaire game.
The issue was brought up...
Cloaking Ixidron off the top of a deck (and i suspect other creatures) will trigger ETB triggers.
I have found this to also be true for clone effects which trigger on enter the battlefield (but not for the game in question).