OP. 15 damage for one quanta is way too much. I understand you don't get to target but this would kill every existing creature in the game short of armagio, massive dragon and a flying titan.
Shockwave does 4 damage and only kills frozen creatures. Most people agree that a card that automatically kills any creature is OP.
I think you should lower the damage quite a bit, though i kind of like the idea. Maybe like 5 and 7 damage or something...