I don't think it should be penalized...yeah, it's a powerful deck, but can be beaten with not many problem with Pestal (throw your steal on time tower and enjoy...); rainbow deck are able to play some gotp with not many problems...maybe there's just the need, like black hole and quicksand, to stop double draw decks to chain more than 2 nightmare (if the can atm), to give you the chance to breath and play some cards...