The purpose of most of the cards, Stuffy included, is to create an impenetrable defense. Opponents will either be too afraid to attack you or will just be unable to get through anyway. After that is set up, all your mana goes to milling them slowly. It's not just meant to win, it's meant to exasperate your opponent(s). You will only win by milling 1 out of maybe 15 games with this deck, but only because your opponents will either retreat or suicide just to get out of the game.
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