The differences from Salvagers are that you can take cards from your opponent, you don't need to pay the cost for these cards and you can have some degree of control of what cards you get, using poison. Another thing is that, as they are acting as weapons, they can't be stopped by sundials, only shields. The drawback is that the creatures have a limited duration.
I like the anti-CC aspect of this card, but it definitely needs to be more expensive.