Quote Originally Posted by Eldonauran View Post
I am also surprised with the number of spellthieves. Though, in hindsight, combining a partial arcane casting class (Corrupt Avenger) with Master Spellthief ... Brilliant. I can see spell resistance being a problem for everyone else. Not for the spellthieves.
EDIT: Yeah, I didn't make a spellthief :P
I don't think there's a Spellthief build that doesn't utilize that particular feat. Even as a monoclassed spellthief it's extraordinarily useful.