another good tactic would be to change the mana base around to other colors and see what happens. (change the color smiths accordingly) changing the mana base would not effect the numerous artifact creatures you currently have but WILL open up many possibilities with instants and sorceries as well as giving you different edges to play off of. (blue = control, black = removal, ect.)
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you should probably take out 2 diregraf ghouls and add in 2 more gravecrawlers since they make the perfect fodder for sacrifice. take out 1 high born ghoul and add in 1 more butcher ghoul for the same reason. finally consider adding in 2 more tragic slips at the cost of the 2 victim of nights. Creatures should be dieing consistently enough that tragic slip should be just as good as victim but for one less mana and not getting blocked by opposing vampires, zombies, werewolves.