you can already run WIndfury Harpy and Charge to do 12. up to 14+ with Abusive or Inner Rage. doesnt see play.
That's three cards to accomplish the same as this (two cards). It's a big deal. Not saying it WILL be the new combo or anything... but just looks scary to do that amount of damage in one turn with no board.
even if we just compare the two card combo, one does 12 for 9, one does 14 for 10. who cares.