It is possible to disable some enemy cards by its cost:
So it can be useful
This is possible, yes, but the chances of it actually doing this is slim to none. Try to see this card as another Control tool, where you get draw against cheaper Aggro decks, potentially messing up their curve by improving your own.
2
Desert Hare + Evolve = Zul'Drak Ritualist
2
25% chance to steal a good enemy minion: Mind Control Tech
6
I would play Arcane Watcher instead
14
Nightmare Amalgam