also check out Rise from the grave its an uncommon i forget which set but its within the Avacyn block. for one black and 4 colorless you can return any creature from any graveyard. and its also a zombie in addition to its other types.
Permalink
Call to the grave would be a nice addition. Try Focusing soley on zombie creatures. You're Captains won't really boost anything but zombies. I have play tested Reap and Moan didnt like them too much. being a sorcery sucks. its too slow. moan isnt too bad cause you get 2 zombies for one more mana. but you can easily add a four drop zombie. such as Skin Render. There are new zombies in Avacyn Restored. Butcher Ghoul is an example. Its a1/1 for two mana but has undying.Rotcrown Ghoulis also new its a common for 1 blue 3 colorless you get a 3/2 zombie that if he dies an opponent mills 5. Gravedigger is also a must. For one black and 3 colorless he makes a great splash in any dual color deck with black. Consider sac bait as well. if you can a mass an army of zombies. Whether it be with infestation or endless ranks. with captains in play your opponent will be losing life regardless. Remove the rune binder sure he makes your zombies bigger and adds more zombies in play but at the cost of losing something in your graveyard. remember you're playing black .REANIMATE!!! Also consider Cemetery Reaper. He's a mix between a Runebinder and a Captain. Gives all other Zombies +1/+1 and for two colorless and one black. tap him to remove a creature card from ANY graveyard to put a 2/2 zombie into play. I love the zombie tribe. If you have any more questions contact me.
if you want to break the landfall ability add in 2 living Tsunami. sure it ties down your mana. but when you can guarantee a mill each turn it may be worth it.
if you're looking for good sac bait try reassembling skeleton. the ghoul you can only play during your turn. Skeleton is just a paid cost. sure it comes in tapped but if your going to be saccing it any way. and i cant tell you how many times ive won all because my opponent let my one blood throne in hell it was my only creature. how much damage can a 1/1 do with no sac bait on the board. you spend even amounts of black and whatever mana to bring your skeleton back into and out of play as many times necessary.