I love the flavor of this card. I think it wins there. On the power I'm just not sure I'd ever use it. It's rather situational, in that it demands your opponent deal damage to one of your creatures. You'd face quite a few decks where your opponent has neither creatures nor spells that do damage to creatures making this a dead draw. And when you take away the gravity pull combo it's hard to use it as creature control.
I'd suggest making it a permanent instead. One that grants all your creatures this protection. It would still be situational that way, but, the payoff might be high enough to suffer the dead draws against a fair amount of decks.
(obviously it's a hard card to balance, too strong in some cases, too weak in others)