
Barator |
Pathfinder Adventure Path, Rulebook Subscriber

The problem with it in Ezren's deck is not how useful it is, but the fact that it goes back in your deck. Anything that is not a spell that you put in your deck means that it will stop you from going deeper in your deck as you play through your turn.
I have been using it on Ezren, but am likely going to be getting rid of it when AP5 comes out for something else.