I've posted this deck before, but it's been a while so how about a fresh thread?

Commander: Sidisi, Brood Tyrant

Dakmor Salvage
Life from the Loam
Golgari Thug
Stinkweed Imp
Hermit Druid
Undercity Informer
Vessel of Nascency
Dread Summons

Apprentice Necromancer
Eternal Witness
Whisper, Blood Liturgist
Havengul Lich
Greenwarden of Murasa
Mikaeus, the Unhallowed
Muldrotha, the Gravetide
Tortured Existence
Living Death

Drowned Rusalka
Viscera Seer
Baleful Strix
Undead Gladiator

Fauna Shaman
Sidisi, Undead Vizier
Rune-Scarred Demon
Vampiric Tutor
Demonic Tutor
Diabolic Intent
Survival of the Fittest

Caustic Caterpillar
Reclamation Sage
Ravenous Chupacabra
Archfiend of Ifnir
Overseer of the Damned
Pernicious Deed
Toxic Deluge

Kira, Great Glass-Spinner
Glen Elendra Archmage
Mana Drain
Sadistic Hypnotist

Death Baron
Lord of the Accursed
The Scarab God

Scavenging Ooze
Zulaport Cutthroat
Loaming Shaman

Deathrite Shaman
Diligent Farmhand
Sakura-Tribe Elder
Wood Elves
Kodama's Reach

Polluted Delta
Verdant Catacombs
Misty Rainforest
Blighted Woodland
Underground Sea
Tropical Island
Watery Grave
Overgrown Tomb
Breeding Pool
Drowned Catacomb
Woodland Cemetery
Hinterland Harbor
Temple of Malady
Temple of Mystery
Command Tower
Opulent Palace
5 Swamp
4 Forest
4 Island
Bojuka Bog
Dryad Arbor
Volrath's Stronghold
Barren Moor
Tranquil Thicket
Lonely Sandbar
Bazaar of Baghdad
Fetid Pools

This is one of those decks where the number of cards you could add is an order of magnitude greater than the number of cards you can add, and really the number of slots that are flexible is limited because there's a certain amount of space you need to devote to card flow, board control, etc. Right around the time Dominaria dropped, I went back and reconfigured a pretty significant chunk of the deck. In particular, I was interested in pursuing a soft reanimator strategy on the back of Whisper. She hasn't panned out as I'd hoped, but the big dorks give the deck more staying power than it had before if you're having trouble going wide.

RtRtR looks like it's going to be loaded for this deck. Both the Dimir and Golgari mechanics play well here, and so far Lazav, the Multifarious, Underrealm Lich, Doom Whisperer, and Glowspore Shaman look interesting. I would like at least one more Disenchant effect and I'm strongly considering adding an infinite combo back in here. I'd also like to up the number of artifact creatures, to play well with Muldrotha, and to add a few more sacrifice outlets, to combat instant speed targeted removal like Swords.

Slots that are up for debate right now:
Undercity Informer
The two Scry 1 lands