Ick. Mono Air gets consistent 6TTW games with this, all the while being completely invulnerable to any kind of defense the opponent might try to throw out at you outside of the seldom used AoE spell cards. PC like Pulvy barely put a dent in a deck with 6 copies half the time, as it's ridiculously easy to have 3 of them out by turn 2. And that's not even including the various broken Nova combos that are floating around.
I'd bump the cost up by 2 at least. Haven't tested it unupped.