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It seems like you're trying to play Vampires and graveyard shenanigans. I think you can only have one here.
You could splash green for Strangleroot Geist and Corpsejack Menace . I think Necropolis Regent is a better beater than Mikaeus, though with your high curve, you'll need to focus more on early game disruption to get your stuff working like you want. :)
This deck looks like one of the best uses of the undying/blood artist combo thing I've seen in a while! If I were running this deck, though, I might take out both copies of Mikaeus, the Unhallowed in favor of another Butcher Ghoul and another Demonlord of Ashmouth , especially since most of your creatures won't benefit much from Mikaeus because they already have undying to begin with.