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i started playing with bone picker, gravecrawler and plague belcher.
i next added my draw engines in
Dark Prophecy
Phyrexian Arena
it needs tuning, but seems effective
18 Swamp
3 Nykthos, Shrine to Nyx
creatures
4 Gravecrawler
4 Dread Wanderer
4 Geralf's Messenger
4 Plague Belcher
4 Bone picker
4 viscera seer
2 abhorrent overlord
2 gatekeeper of malakir
4 Phyrexian Arena
3 grave pact
demon of death's gate?
doomwake giant?
Shadowborn Demon can be a removal on a creature and also a sac'-outlet untill your GY gets filled, I'd take it over Abhorrent Overlord.
Another more expensive option which pretty much requires a powered up Nykthos to cast would be Razaketh, the Foulblooded.
Having some more traditional cheap removal (Push, GftT, Victim) might be better than Grave Pact and Gatekeeper of Malakir here.
If you stick with zombies then Relentless Dead is most likely your best option.