Hearthpwn

It's hard to see what deck/s specifically would want it, but fact is, if you get to attack with this once - which has a higher likelihood than normal thanks to stealth - and actually make good use of the mana, it's effectively a 3/5 for 3 (with potential further upside) - while it did cost 4, it's essentially investing that extra mana into the next turn.

It's essentially a better statted, much more reliable Pint-Sized Summoner.