Auto Play
I know the AI is pretty lame, but this one takes the cake.
My current favorite trio to play the arena is Rain bird, Druid, and Rogues, so I'm trying to mastery them up. I'm playing CRC on auto play. In the final round, all you need to do is attack PP once with each and he will die before his second round attack. The computer takes 9 or 10 rounds because it never attacks. Hang on, that's not right, it does attack, with the rage chili on Blues, which of course does nothing but stun for 1 turn. All it does is have Chuck and Matilda heal (regardless if anyone is injured or not), and then cupcake trap. When the bombs show up, chuck heals (even though an attack would take care of both bombs and infect PP as well) and the other 2 attack the bombs. It wins every time, but it's so damned frustrating to watch.