Neat idea, but it definately needs to be a Darkness card. =/ Also, if you used this on a Vampire, would that Vampire make you gain twice the life, because it would gain the effect twice? o-o
I don't think so. I wouldn't use it on a vampire anyway. I would use it on a golem with 30|23 or a scavenger mutant with high attack or a supper buffed dragon.
The issue I'm seeing with it is that there's only really two possible scenarios with creatures that have 30 attack:1) You're 1-2 turns from winning2) They have a shield/sundial up that's completely nullifying the damage.There's not many situations where you'd actually change the tide of the game with this card.