No one mentioned ELVES?!?!?!
I dropped two Biorhythms into my Elf deck and got a
THIRD TURN KILL!!!
It was a god-draw, something like Forest, Llanowar, Quirion Ranger, Priest of Titania, Wirewood Lodge, Biorhythm.
I was reading one guy's tourney report about his Burning Wish control deck that would kill with Biorhythm once he gained control of the game. He says it's because it's just the quickest kill card he found for the deck, and he won 4 or 5 games with it.
That being said, the 'rhythm is an eight-mana monstrosity, but that's to keep it casual, and possibly from dominating tournaments if it cost, say, six mana (like the current 'I win' card - Upheaval).