I just saw the bot turning "Ragnaros the Firelord" into a sheep with polymorph. Then after it turned to a sheep (1/1), it polymorph the 1/1 into a sheep again and then fireblast the sheep. thus wasting a polymorph for nothing. Still won the fight luckily, but it certainly was some kind of error.

This was while running max calculation settings, with DeckRules_Control. haven't tested this with default settings.