User blog comment:JBox2D/A dedicated anti-mage champion/@comment-4714821-20140223020109/@comment-24090662-20140224220421

I think that spell stealing a powerful initiation ability would be gated by the fact that almost every ability like that involves it's target getting right into the middle of things (Cyclone, Unstoppable Force, Assault and Battery, Curse of the Sad Mummy, etc), and you're not going to be building her tanky (probably), so it would be like trying to initiate as an AD Carry.