I'm liking the looks of that gravity deck with quints, but I've only got one amber nymph. For those few lucky enough to have 3-4 of them, I'll bet something similar to this would work very well. If you could get a quinted nymph out on turn 3-4 or so, you'd have the game in the bag. (although that's true against a lot of decks :p) Running out of cards might be a problem, though rainbow does have double draw and a lot of hourglasses, so maybe you could win by decking him if you didn't get any damage out early.