Yes, I agree, it is a nice card to fight the AI, but we haven't been able to test it in pvp yet, where it will be really annoying, if it won't be an almost direct win card.
I mean, there are only a few no spells that can deal with those, being: otyugh and scarab, but they will get poisoned, mind flayer, lobotomizer, arctic squid, some nymphs (red and auburn one for example).
The nymphs are too expensive, so you won't be able to get them out, unless you are lucky enough to be able to play them when you draw them. So that leaves only water and aether do do something.
I will ruin spell decks especially those with miracle, stone skin, or bolts.
I think it is to much of a game change, because even more people will feel forced to play a rush deck, to have least trouble.