Pretty good card. Awesome in arena. Might see constructed play. Effect is much better than people think. People bring up bgh, but it can't actually be bghed untill it has been buffed twice, in which case it has attacked for at least 8 damage. Main weakness is that it is easy to remove before the first buff.
And to the person who thinks that +2/+2 for 2 mana "sucks": It's +2/+2 and hero power for two mana without spending a card. Which is pretty awesome value.