That is pretty cool, and would be particularly valuable in light, which is weak in no small part because it can't destroy permanents or creatures. (except with holy flash) As far as I know, though, the only way the opponent's hand could be full at the time this processes is if you just used Nightmare on them. It's definitely a card I'd use.
It also would be in the unique position of being able to disarm a protected weapon. (well, maybe; depends how you wanted to do it) I'm not sure if you can freeze/delay protected weapons, since that happens so rarely.