Need:
$ Liliana, Untouched by Death

Consider:
Fetid Pools
Darkwater Catacombs
Tainted Isle
Underground River

Mesmeric Orb - Self-mill to generate options, and add some pressure on opponents' libraries as well
Ashnod's Altar / Phyrexian Altar

Geralf's Mindcrusher
Grave Titan
Vindictive Lich
Open the Graves
Liliana, the Last Hope
Corpse Augur
Ever After
Forbidden Alchemy
Hero's Downfall
Phyrexian Delver
Skinrender
Whip of Erebos
Kalitas, Traitor of Ghet

Vengeful Pharaoh
Distant Melody
Profane Command
Urborg + Cabal Coffers/Magus of the Coffers/Crypt Ghast
Screeching Skaab
Carnage Altar
Attrition
Reprocess
Dystopia
Scytheclaw
Bonehoard
Necropolis Regent
Mass Polymorph
Synthetic Destiny
Cellar Door
Skullclamp
Victimize
Cemetery Recruitment
Scourge of Nel Toth
Deepfathom Skulker
Necromaster Dragon
Extractor Demon
Elixir of Immortality
Bad Moon
Syphon Flesh
Living Death
Victimize
Skullclamp
Metallic Mimic

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Considered cuts:
* Wonder - Not a zombie
From Under the Floorboards - If it's hard to discard, it doesn't do a lot, but it's nice to have
Kindred Dominance - Expensive, but can be good for an alpha strike
Grave Betrayal - Expensive
Risen Executioner - Recasting it can quickly become too expensive, and it can't block
Stitcher Geralf - Only gets one potentially big zombie, but I'd rather go wide. 5+3 mana is a lot to spend on this. It's Geralf, though, and he does self-mill too
Cyclonic Rift - Expensive to cast, and probably need it more in another deck
Corpse Harvester - Too slow?
Prized Amalgam - Not amazing without Gravecrawler etc

Counterspell - UU is actually kind of hard, and I don't really want to be holding up mana
Army of the Damned - Expensive, but 13 zombies is a lot, and having flashback is important for a comeback
Altar of Dementia - CAN go infinite with Undead Alchemist, trigger morbid, self-mill, or mill someone who board wipes, but is it enough? Self-mill is probably important here

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Cuts:
Rise from the Tides - Not enough instants and sorceries
Zombie Infestation
Eldrazi Monument - Probably better used in Meren
Urza's Incubator - A lot of the zombies cost BB, so the cheap ones aren't getting much of an effect, and all the non-zombies get no effect. Plus 6 mana is quite a bit, and it's not a creature
Obelisk of Urd - Would rather just have more zombies (lords)
Dread Slaver - It's unlikely that I get to block anything with this, and they're definitely not going to block it with something that would die, so really this is either a 5-mana 3/5 unblockable by small dudes or a 5-mana 3/5 "moat"
Pontiff of Blight - Just because he's a zombie and does some draining does not mean I have to play him. He's the least effective 6-drop
Dimir Keyrune - Upgraded to Signet
Nantuko Husk - Don't need the sac outlet that much, and the benefit of it is not that great
Cruel Revival - Expensive removal, and zombies don't really need to be returned to hand
Havengul Runebinder - Don't want to exile my creatures
Dread Wanderer - 1 card in hand might be hard?
Gravedigger - Most creatures can be cast from the graveyard anyway
Overseer of the Damned - Non-zombie and expensive, sorcery-speed removal, but can get me lots of zombies
Skirk Ridge Exhumer - Don't know how much stuff I want to discard for only a 1/1
Thornbite Staff - Combos with Gisa, but doesn't do much other than that
Fatestitcher - Zombie-based ramp, but not that impactful as a zombie and a bit expensive and fragile for ramp
Decree of Pain - Expensive, replaced with Kindred Dominance
Lim-Dul - Too expensive in all ways
Empty the Pits - Too expensive, and eats resources I ususally don't want to lose unless I'm winning
Withered Wretch - "Only" does targeted graveyard hate, which is probably not good enough
Grimoire of the Dead - Very slow, and easy to get 3-for-1ed
Ancient Excavation - Decent to upgrade my hand, but doesn't gain any card advantage
Necromancer's Stockpile - Only lets me discard creatures, which is pointless unless I have G&G or someone is wheeling (but then why do I have mana open if I have creatures?)
Drunau Corpse Trawler - Two bodies is good with lords, and deathtouch is nice, but expensive to activate
Tragic Slip - Morbid might be difficult atm
Compelling Deterrance - Not hugely impactful
Carrion Feeder - Mostly just useful to trigger morbid or as a early zombie
Corpse Connoisseur - If I have Gisa and Geralf out, this is kind if like drawing a card, and it can be used twice, but might be a bit too expensive for this?
Secrets of the Dead - I only really have Gisa and Geralf to cast things from the graveyard, limited at once per turn if I even control them, so this is probably not worth it
Dimir Cluestone - Replaced with Commander's Sphere (cheaper sac)
Vanquisher's Banner, Door of Destinies, Herald's Horn, Coat of Arms - Used in Edgar
Opal Palace, Blighted Fen, Blighted Cataract - Low land count and heavy color requirements make these not ideal. They are unlikely to give me much benefit anyway