He seems fun... BUT...
Activate this ability only once each turn.
If an opponent has burn, he will always burn it in response to you using the ability, or just wait for you to use it while facing a menacing 1/1.
In a format where Goyf is barely making the cut, I can't see why a worse Goyf that is more mana intensive would make it.
I actually think I'd play Werebear over this guy.