Fiend Artisan is green

I think Sidisi, Undead Vizier is awful unless you use a lot of reanimate effects, it's just so expensive to tutor. Geth, Lord of the Vault is crazy strong, but he's a totally different deck most of the time. I'd dump Liliana's Steward too. You and one other player go down a card, putting the rest of the table ahead of you by one card, but they also get to choose, so you're never going to get the card you want out of their hand.

Hobbling Zombie and other cards like it, like Putrid Goblin are excellent at keeping attacks away from you while you build up your board. and the pseudo revival effects let you abuse a lot of other zombie mechanics. Butcher Ghoul, and Geralf's Messenger or Doomed Dissenter are ok too. i wouldnt use Sightless Ghoul though. They are all better than Reassembling Skeleton though. Keep Relentless Dead. Im not sure if they make the cut, but they arent scary, but that means they are good at keeping a target off your back til youre readyfor one.

Magus of the Bridge is great for a non-zombie. Probably use it over Tainted Adversary, i feel like that one just costs way too much before its good. Dreadhorde Invasion is incredibly good, as is Mikaeus, the Unhallowed. i'd put those in for sure.Tormod, the Desecrator is still really good. Zombie Trailblazer is devastating to the person sitting to your left in particular or anyone playing five colors/ not black. When you REALLY need someone to not cast a spell. make all their lands swamps during the upkeep. almost every board wipe is a sorcery.

I think you might want to dump Thought Vessel for Mind Stone or even Blood Pet. In many cases discarding is beneficial to zombies. If you want to keep infinite hand size, Zombie Infestation and discard at will cards are pretty helpful.

I think Noxious Ghoul is the single best zombie card in the game, in this deck it basically says, tap your commander, wipe everyone else's boards. Use it.

Sutured Ghoul is runner up. If you include it and other high power zombies like Rotting Regisaur you can put him out as a 20+/xx easily, and then get 2/2s. HE doesnt play nice with mass reanimate, but he's an alternate win condition on his own. also its a great tool since youre probably gonna sac the dino and Phyrexian Soulgorger pretty quickly. If you sacrifice him on the end step before your turn i think you will almost always have a game ending horde.

Gray Merchant of Asphodel is utterly stupid. The absolute best reanimate target you could hope for. and since your card draw is gonna cost a ton of life, hes always going to be valuable. Whip of Erebos is probably the only other reasonable lifegain choice.That one makes aggressive attacking suddenly super safe

Jadar, Ghoulcaller of Nephalia is really cheap at making zombies if you dont have any other sources of decayed zombs. they cant block, but you get so many death triggers

Graveborn Muse is great card draw.

Hatred is usually better than Endless Scream

I think Gempalm Polluter is fantastic. its card draw, puts a big zombie into your graveyard, and hurts a player if things are going well.

I don't think Endless Ranks of the Dead is that great, but it certainly is cool. Wand of Orcus is really cool too. I'm not sure if its good though.

Board wipes will shut you down as you have things right now. Crowded Crypt and Kalitas, Traitor of Ghet, that way, even if there's a board wipe you still have a whole army of zombs to multiply even after everything is dead. Rise of the Dread Marn is another fantastic option that you can abuse if you run things like Carrion Feeder too. Run Carrion Feeder, period. It lets you loop gravecrawler and saves yourself from control magic and exile spells.

Consider Toxic Deluge and STRONGLY CONSIDER Nevinyrral's Disk. Single target removal like tragic slip is ok because you can choose when things die, but other cards like Malicious Affliction are going to miss a lot of key targets. And you absolutely need to have a way to clear artifacts and especially enchantments.

Dark Salvation is pretty cool. not sure if it is good enough, but i'd use it rather than some of your spot removal.

Liliana, Dreadhorde General is really absurdly strong if you can get it out, and even if it dies the next turn you can draw a bunch off of it. Liliana, Heretical Healer  ^Flip you already know is great.

If you diversify your black lands, Field of the Dead is the best land. its silly how good it is. I'll start you off with the autoinclude Unholy Grotto. Malakir Rebirth  ^Flip is too.

I'll see what you make and see if i find anything else. later

It isn't a zombie deck if you don't run Zombie Apocalypse