Thematically, I LOVE this card. I think of deep-sea creatures as being mysterious and self-protective. Functionally it's very cool as well. A water deck could protect it's SoP + creatures while they grow, and protect its arctic's while they hinder the opponent's creatures. I agree with previous commenters that the ability cost should go up (perhaps 2?). I also like the "freezing turns it into Arctic" thing.
