Well built deck, i'm not really a fond of Grave Pact cuz it takes a while to cast and until then i'd have sacrificed pretty much every creature that came in my hand, but the Dark Rituals are really useful to make it an early game cast (besides making it much quicker to cast DoDG). Well done.
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Actually i did think of adding Dark Ritual, tho it's too old =x. I'm only using relatively new expansions.
I guess i could add as a sideboard reverberate as a side against control decks, that way i would Mana leak the opponent's mana leak, haha. I'm still gonna work on the sideboard properly, however.