I heard Richard Garfield used to enjoy showing some overconfident players up. He'd strip a couple of starter decks and just play his sealed deck against their standard decks. He'd put up a good show, too, from what I heard. His all-oversized decks reportedly didn't do too badly. Barring the broken, game-breaking Type I drawing effects and "unique" cards such as Moat and Abyss, sometimes, it's not so much the deck but the structure. If you take a Sligh deck and remove all the cards and replace them with something else, even if you have lousy burn and lousy cheap creatures, one way or another, you'll still end up with a deck that plays like a Sligh.