I LOVE this idea. The rarity of the cards or the 2 week charge timer would be awesome. Obviously having an I win button you can use often is a bad idea, but as Yoshi-P said, "It's OK to go overboard" (every once in a while). Even if it instant cleared content (which I sincerely doubt it will) from the sound of it, it wont be something that they can abuse. You'll have heavy restrictions on it.