Bolf is weird, the card seems good at first look but I'm not sure what is the right way to play it in any match up, not just aggro that ignores it and goes face still.
VS aggro, you just heal 9 for 6 and it's probably going to die and leaving nothing on board, isn't it better to heal 8 for 5 and have a 3/3 body that can get back in your hand with freezing trap? It's just that nobody is going to trade with this ever. It's not going to kill anything, Maybe it's best to play this behind a taunt and hit face with it?
VS other types, I don't know. I'm a bit confused in how to effectively play this.