Well....that's just nutty. Also has one of the two DPS enchants, making it a solid beatstick against non OP classes. Hmm...can't think of a class that could better advantage of it than a Barb off the top of my head. As you said, Blood Thirst for spells is pretty sick, and I bet most passives for other classes don't work well with spells. Maybe a Fighter, to Charge to the mage of choice, Knock Down so he can't cast while you steal his spells with extra armored fighter attack speed, Charge out when you got what you wanted, and activate Fighter Acc boost (which I think is unversial), then begin the spell spamming?
Can you steal spells from you allies by chance? That could be interesting.
I tried to steal spells from my allies and couldn't get it to work, both in combat and out of combat.