I'd totally use this card; I love this kind of stuff. Cards that let you use things your opponent has can make for some very interesting game scenarios that don't usually occur otherwise. In addition to taking a potentially useful card (or a win condition) from your opponent, it would also make their deck one card smaller, which means you might win by deckout. It also doesn't have the vulnerability to PC that mindgate does, and isn't a rare like SoSe, so newbies can also make use of it.