Lol, nice to see edh decks, they seem to be popping up alot now. My recommendation is to take out: Teleport, sacromancy, fear, ohantasmal terrain, serpent generator, the hive, sisters of the flame, raise dead, and scathe zombies: all of these have to small effects for edh, I would recommend going to magiccards.info and doing a search for stuff that says zombie in its text box, there is alot of good stuff especiall in alara block, and onslaught block that uses zombies, and the deck can be made alot stronger through that.

Needs more creatures

Oversold Cemetery and Nether Traitor spring immediately to mind. Bloodghast as well.

You should put in Beacon of Unrest ...it's one of the best reanimation spells in EDH.

6/13/2013 Changes: out: Cabal Coffers | Diabolic Servitude | Hamletback Goliath | Expedition Mapin: Swamp | Breaking // Entering | Evil Twin | Izzet Guildgate

Still feels like I need to get some better creatures/instants/mana. Any suggestions?

Hey man, I also have a Sedris, the Traitor King EDH deck, check it out and see if you like it and maybe you can get some ideas and +1 it if you like it!

+1 from me. Long live the king.

Oh, here's my deck The Kingdom of Sedraxis

Sheoldred, Whispering One is a good re-animator card.