Here's a combo I've never seen, but it could work. Get a Dark Magcargo Active, and have Rocket's Minefield Gym in play. If your opponent plays a Baby from his hand, and fails the Minefield Gym flip, he just gave you a free Prize! If he gets past the Minefield Gym, just use Ball of Flame and discard a (R) Energy to finish it off! Of course, the bad part is that it goes both ways.