22 lands is abysmally low. You should be looking for something in the 26-27 land range. 28 isn't out of the question by any means.
Chancellor of the Dross isn't a great 2-of. I would only advise playing him as a 4-of and only in metas where you're allowed to take free mulligans (I know that most casual MP groups allow players to take a free one). If you want awesome drain, go with Exsanguinate. Your deck just plains wants 4 of them. They're like ****ing free, they're from a recent set, and they're flat out AMAZING in multiplayer.
Barren Moor isn't worth it. It's just not. For lands you want Cabal Coffers (at $8.00 per I'm not surprised that you don't have 4), Urborg, Tomb of Yawgmoth (lol $15.00!) and Leechridden Swamp. That's it. Anything beyond that is probably just plain worse than a Swamp. It's going to hurt your Coffers, hurt your Lashwrithe, etc. Swamps are just baller (keep in mind that Leechridden Swamp is a Swamp).
Dark Rituals are meh in your deck. You don't have cards like Demonic Tutor, Vampiric Tutor, Yawgmoth's Will, etc. that allow you to make big, explosive end-game plays. Ritualing out a Hippy isn't very scary in multiplayer, it's not worth 2 cards. These should instantly be converted into lands, and even then you'll still want to make room for at least 1-2 more.
As far as good creatures goes, some of my favorites are Dread, Dread Cacodemon, Reiver Demon, Mortivore, Havoc Demon and Helldozer (super underrated card in multiplayer). There's nothing wrong with your creatures I just wanted to give some shoutouts to these kinds of cards :P. Obliterator is a ****ing Moat that also serves as a win condition so I'm glad to see him in here.
There's a guide in my sig that you might want to check out.
3x Vampire Nighthawk
1x Phyrexian Obliterator
1x Bloodgift Demon
1x Pestilence Demon
Sorceries: 21
4x Sign in Blood
4x Consume Spirit
3x Innocent Blood
3x Syphon Mind
2x Beseech the Queen
1x Life's Finale
1x Beacon of Unrest
1x Promise of Power
1x Sever the Bloodline
1x Damnation
2x Necromancy
2x Enslave
Instants: 3
3x Dark Ritual
Artifacts: 1
1x Lashwrithe
Planeswalkers: 1
1x Liliana Vess
Lands: 24
2x Cabal Coffers
2x Barren Moor
20x Swamp
Multiplayer:
MonoBlack
Mono-Red
Cycling
Crush of Wurms
Zoo
Immortal Coil
Control
Reanimator
Mono-G
Cruel Ascension
Landfall
Esper Spirits/Tokens
Phantom Vigor
Not Explicitly Multiplayer:
Allies
Bant
Artifacts
Chancellor of the Dross isn't a great 2-of. I would only advise playing him as a 4-of and only in metas where you're allowed to take free mulligans (I know that most casual MP groups allow players to take a free one). If you want awesome drain, go with Exsanguinate. Your deck just plains wants 4 of them. They're like ****ing free, they're from a recent set, and they're flat out AMAZING in multiplayer.
Barren Moor isn't worth it. It's just not. For lands you want Cabal Coffers (at $8.00 per I'm not surprised that you don't have 4), Urborg, Tomb of Yawgmoth (lol $15.00!) and Leechridden Swamp. That's it. Anything beyond that is probably just plain worse than a Swamp. It's going to hurt your Coffers, hurt your Lashwrithe, etc. Swamps are just baller (keep in mind that Leechridden Swamp is a Swamp).
You have a lot of single target effects. I don't like them. Instead of playing Hypnotic Specter, I play Scythe Specter and sometimes even Liliana's Specter. Global discard > localized discard. Same thing goes for your removal. I would personally field cards like Innocent Blood, Fleshbag Marauder, Abyssal Gatekeeper, Mutilate, Massacre, Barter in Blood and Syphon Flesh. Syphon Flesh in particular is just sexy as all Hell. Altar of Shadows is slow, but it's awesome in the ultra late game.
Dark Rituals are meh in your deck. You don't have cards like Demonic Tutor, Vampiric Tutor, Yawgmoth's Will, etc. that allow you to make big, explosive end-game plays. Ritualing out a Hippy isn't very scary in multiplayer, it's not worth 2 cards. These should instantly be converted into lands, and even then you'll still want to make room for at least 1-2 more.
I hate Sign in Blood. It's so freaking weak. I'll always use Staff of Domination, Skeletal Scrying, Promise of Power, Necropotence, Yawgmoth's Bargain or even Necrologia. Don't let lifeloss scare you by the way. 4x Exsanguinate makes life irrelevant.
As far as good creatures goes, some of my favorites are Dread, Dread Cacodemon, Reiver Demon, Mortivore, Havoc Demon and Helldozer (super underrated card in multiplayer). There's nothing wrong with your creatures I just wanted to give some shoutouts to these kinds of cards :P. Obliterator is a ****ing Moat that also serves as a win condition so I'm glad to see him in here.
There's a guide in my sig that you might want to check out.
Guilds of Ravnica - Commander 2018 - Core 2019 - Battlebond - Dominaria - Rivals of Ixalan - Ixalan - Commander 2017 - Hour of Devastation - Amonket - Aether Revolt - Commander 2016 - Kaladesh - Conspiracy 2 - Eldritch Moon - Shadows Over Innistrad - Oath of the Gatewatch - Commander 2015 - Battle for Zendikar - Magic Origins - Dragons of Tarkir
Green - Blue - Red - White - Gold
Working on getting those Exsanguinates Tich haha
Multiplayer:
MonoBlack
Mono-Red
Cycling
Crush of Wurms
Zoo
Immortal Coil
Control
Reanimator
Mono-G
Cruel Ascension
Landfall
Esper Spirits/Tokens
Phantom Vigor
Not Explicitly Multiplayer:
Allies
Bant
Artifacts