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I feel like you need a reliable creature sweeper. Damnation would be your best option. Pernicious deed is a versatile all-star but you cant expect it to fill the role of sweeper all the time. Also abrupt decay seem like it should be a 4 of, mostly because its the fast decks that will give control the most problems. Glissa the traitor could work really well, with some sort of artifact cantrip. Like nihil spellbomb for instance. Keep purging their graveyard while basically drawing a card every time one of their creatures die.
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The more I look at the deck, the more I realize its actually a midrange deck. So forget the damnation comment its prolly not going to help you a whole lot. I stand by the other two suggestions and have a few more. Deathrite shaman is an absolute all-star in these types of decks and can help power out your 4 drop a turn early. I would also try and run something like Ravens crime/Life from the loam engine to ensure you can cause the heavy control players some problems. An engine that would continually rip their hand apart turn after turn you force them to play a more proactive strategy which should be an auto win for you. Otherwise great concept and let me know what you think.
I made another build of this deck that incorporates life from the loam/retrace spellshttp://www.mtgvault.com/dknight27/decks/leg-rg-manipulation/