I'd take out mind sludge. By the time you have enough mana to play it, they most likey wont have cards in hand.
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Instead of pestilence, I would put in sanguine bond, because if you have that in play when you play blood tribute, it's an instant win.
Ooh, I have a deck like this. It's blue though, and I have Pariah's Shield in there. Equip it to Stuffy Doll and any damage that would be done to you is done to Stuffy Doll instead, so you never take damage lol.