May I suggest some Reassembling Skeletons to team with Grimgrin, and maybe some Dream Twists to us with Nephalia Drownyard to help Undead Alchemist. I love the deck. I'm researching in order to build one of my own.
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4x Blade of the Bloodchief would be good to add to this deck. You could use Butcher of Malakir's ability to buff some of your creatures. Just sayin :)