I think this card is really really good. The problem is that it has to enter the battlefield before turn 3. At that point unless you are a control deck the game it's almost decided.
I feel a Bant deck with this guy and Tarmogoyf has a lot of potential. Maybe a counter-top deck? Maybe with Stoneforge? One thing it's clear for me, by it's own he doesn't win games, it's not like you can include it in any deck with blue and hope it will be unbeatable.