Agreed with Talonz. Two rolls to get off a spell? Who else has that?
Also, the gut magic is becoming essentially useless, as everyone will just let you cast it and then dispel in their own magic phase. Dispose of the RiP rule and all will be fine.
About the braingobbler- I quite like it. Saved my butt quite a lot of times, actually. Maybe it could be a choice, like: After successfull cast, the butcher can opt for one of these effects: panic test or make an Ogre unit frenzied, or ItP.