@Anonymous, if you find the need for a comment so unrelated to the card itself that this topic is supposed to be about, shouldn't it be in a PM?
I like this one and think something of a similar mechanic needs to be introduced into the game. However, I think what would be more balanced is adding the creatures attack and hp together and dividing by 2. I can just picture you are about to win, you save yourself by getting that CC you need to wipe out that Ruby Dragon, but then you STILL die by killing the Ruby Dragon. I think the hp+att/2 would make it a tad less powerful.