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This is a slight modification to a deck I submitted a few years ago through a different account. Lost my info, and am now getting back into MTG. Anyways, here it is... Dark Ritual right away for quick mana, Piranha Marsh for guaranteed damage, Tendrils, Douse in Gloom for life theft, Demon's Horn in an all black deck is nice, Necropolis Regent makes Nightmare and Daggerdome Imp that much better. The rest is self explanatory.
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The Demon's Horn is a bad card. You should replace it with something else entirely. You have enough sources of life gain elsewhere if you really need it but lifegain in general is a weak mechanic. I would replace it with a creature since you're fairly light on those. Vampire Nighthawk gives you a creature on the 3 CMC on your curve with lifelink, deathtouch and flying. Amazing utility and still gains you life. Piranha Marsh is counter to your strategy and just slows you down. Replace it with Leechridden Swamp which do carry the Swamp subtype that a lot of your other cards care about and has repeatable life loss to all your opponents, not just once to one player and then not counting as a swamp. Liliana's Shade might be useful as well since it tutors up any swamp (including the Leechridden Swamps) and gives you a mana sink to buff itself which works nicely with the regent.
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Thanks Epsilon, I just added those to my wishlist for my next starcitygames order.