gempalm polluter might also be nice, ofc you will be using his cycling ability,
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maybe zombie master, remember he is considered a zombie
btw go check out my zombie deck http://www.mtgvault.com/ViewDeck.aspx?DeckID=66971
Like the idear of first sacrificing all of your creatures to carrion feeder and then play Patriarch's Bidding. I would take out a couple of the expensive cards and add some of the 3 mana zombies which buff all zombies, like cemetery reaper, death baron (he gives deathtouch which is always cool, and will often scare your opponent of, giving you time to get some more expensive creatures out) also you might wanna consider lord of the undead to return gempalm polluter to your hand and then cycle it again, (with 6 mana you can cycle it twice every turn, dealing out some serius damage, and drawing more cards). Also festering goblin would be nice, in this deck.
you may wanna add counterspell