When I took apart a Korlash, Heir to Blackblade deck for parts in the OG Dakkon Blackblade, it left a awkward hole in my heart for some good ol' mono-black EDH. While I've been meaning to remake Korlash, Yahenni, Undying Partisan has been whispering to me as a replacement, and the more I think about it, the more it makes sense.
So here is a first draft for me, Yahenni voltron:
3 Yahenni, Undying Partisan
Lands (38)
0 Bojuka Bog
0 Cabal Coffers
0 Cabal Stronghold
0 Crypt of Agadeem
0 Deserted Temple
0 Forbidden Orchard
0 High Market
0 Myriad Landscape
0 Nykthos, Shrine to Nyx
0 Rogue's Passage
23 Swamp
0 Thespian's Stage
0 Urborg, Tomb of Yawgmoth
0 Vesuva
0 Volrath's Stronghold
0 Westvale Abbey
Creatures (25)
2 Bloodghast
2 Reassembling Skeleton
3 Burnished Hart
3 Crypt Rats
3 Ophiomancer
3 Pawn of Ulamog
4 Bloodline Keeper
4 Crypt Ghast
4 Disciple of Bolas
4 Erebos, God of the Dead
4 Korlash, Heir to Blackblade
4 Liliana's Shade
4 Mortis Dogs
4 Solemn Simulacrum
4 Twilight Prophet
5 Magus of the Coffers
5 Puppeteer Clique
5 Thrashing Wumpus
6 Grave Titan
6 Nightmare
6 Nirkana Revenant
6 Noxious Gearhulk
6 Skeletal Vampire
6 Steel Hellkite
6 Sheoldred, Whispering One
1 Blade of the Bloodchief
1 Expedition Map
1 Sol Ring
2 Blackblade Reforged
2 Jet Medallion
2 Spawning Pit
2 Swiftfoot Boots
2 Sword of the Animist
3 Nuisance Engine
3 Whispersilk Cloak
4 Bonehoard
4 Helm of the Host
4 Lashwrithe
4 Nightmare Lash
5 Batterskull
5 Lifeline
5 Worldslayer
6 Caged Sun
Sorceries (5)
2 Demonic Tutor
3 Death Cloud
4 Damnation
4 Evincar's Justice
5 Crux of Fate
Instants (1)
5 Hatred
Enchantments (12)
1 Phyrexian Reclamation
2 Bitterblossom
2 Oversold Cemetery
3 Attrition
3 Necropotence
3 Noxious Field
3 Phyrexian Arena
4 Endless Ranks of the Dead
4 Endless Whispers
4 Grave Pact
4 Pestilence
6 Infernal Genesis
[EDH In Development] Kynaios and Tiro of Meletis | Trostani, Selesnya's Voice | Queen Marchesa | Ruhan of the Fomori | Yahenni, Undying Partisan
[EDH Retired] Ertai, The Corrupted | Sigarda, Host of Herons | Tariel, Reckoner of Souls | Korlash, Heir to Blackblade
[Modern] Stuffy Doll Combo Burn | Demigod of Revenge