Depends on the new meta, but my suspicion is that this card won't see any play. Using your hero power turn 2 is too weak, even with the buff, and late game it's way too easy to remove. It's like a worse Light Warden (which gives you +2 attack), and nobody would play that if it wasn't for Light of the Naaru.
There's no way this will replace zombie chow. The 3 health is the difference between a 1 for 1 and a 2 for 1, and it doesn't need you to activate your hero power. The five life doesn't really matter at all.