This card would just make OTKs too easy. This + Sky blitz would be 4x damage for airborne creatures which is just too easy to make 100 (or 200) damage. If you could make it so that the 0 damage turn came first then it might help. Something like, "Creatures alternate between being delayed for a turn and dealing double damage". Other buffing effects could be subbed in if the double damage is a problem, perhaps dealing +2 extra damage then -2 extra damage or something.
Also, the idea part of the card table is for you to put the name of whoever thought up the idea, not the idea itself. So it should say "iskelion" if you came up with the idea.
EDIT: Sorry, didn't notice the poll, voted 0 damage