Your mana sources seem a bit low for a two color deck. Have you run test draws on the deck. I think you’d struggle some against a fast mono black vampire deck, especially since you need two black sources for some of your staples like the Nighthawk (and you have to factor in some of your lands getting tapped) - you basically have 16 black mana sources not all of which come in untapped. Running that deck as it currently stands, I'd worry about getting mana hosed straight out the gate.
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I created a deck based on the same idea but which used the Urza lands to power the Prosperity draws, and then relied on Black Vise, the Viseling, Stormseeker (and the red equivalent) to do it's damage.