As a fan of Water, Aether, and Ice, I love this deck.
I can't really find a way to improve it; it really is very well made. Personally, I'd just take out a Flooding and slap down another Aether Pillar because decks with +7 creatures aren't too common and 2 Floodings are still plenty to get one out early.
But that's just personal preference. Great deck.