The fact that it can only target minions rather than all enemies makes it surprisingly consistent: if your opponent has one non mech minion and you play this on your empty or mech filled board, you don't have to worry about stray shots going face: you can kill up to a 5 health minion, which is pretty high tempo.
I'd say it's OK. Wish it was slightly cheaper so it can be utilized more effectively for the match up it'd be most crucial in, which would be against aggro.
2
The omega battlecry works if you have 10 mana yes, this makes zola even more useless and grumble even more important