Stop that Thief!

I was right - stealing a card that has an effect relating to the steal gives the stealer the ability to trigger those effects. So steal a Karak Necklace, draw 2 cards. Steal a Karak Band, gain 2 energy on your magi. Steal a Corathan, get a card from discard. Not too bad really. Of course, anti-theft is going to be big too.