This might be a bit generic, because there’s already quite a few sac-centric decks, but at least its monoblack, so lets try this out.

What should we do with this? I’m thinking we want to do a lot of damage early and then grind out the rest with time. This might not be the best tactic in EDH, but it’ll have to do for now. Note that I’m not trying to do the most explosive deck here. Instead, I’m trying to come up with something that can win in a fairly casual environment. I’m light in removal and card draw intentionally.

First, Bontu’s own sac ability is pretty good, but I don’t think its good enough in many cases, especially with the mana cost, so let’s bring in a bunch of saccers.

[draft]Altar’s Reap
Attrition
Barter in Blood
Crypt Creeper
Disciple of Bolas
Innocent Blood
Sadistic Hypnotist
Shriekmaw
Viscera Seer
Burnished Hart
Champion of Stray Souls
Magus of the Abyss
Qarsi High Priest
Blood-Chin Fanatic
Ghoulcaller Gisa[/draft]

Next, recursive creatures or spells that give you several creatures:

[draft]Army of the Damned
Endrek Sahr, Master Breeder
Exsanguinate
Gravecrawler
Nether Traitor
Reassembling Skeleton
Bloodghast
Syphon Flesh
Epochrasite
Ophiomancer
Bloodsoaked Champion
Dread Wanderer
Despoiler of Souls
From Under the Floorboards
Endless Cockroaches[/draft]

Might be a few too many, but we’ll see. After that, some other creatures we don’t really mind sacrificing:

[draft]Big Game Hunter
Corpse Dance
Gatekeeper of Malakir
Kokusho, the Evening Star
Nekrataal
Withered Wretch
Pilgrim’s Eye
Solemn Simulacrum
Liliana’s Specter[/draft]

We also need some ways to gain benefit from all those creaturs dying:

[draft]Blood Artist
Butcher of Malakir
Falkenrath Noble
Grave Pact
Skirsdag High Priest
Grim Haruspex
Liliana, Heretical Healer
Shadows of the Past
Dictate of Erebos
Zulaport Cutthroat[/draft]

Finally… well, finally in the sense of remaining in theme, some ways to syphon away that life.

[draft]Suffer the Past
Urborg Syphon-Mage
Gray Merchant of Asphodel
Servant of Tymaret
Ob Nixilis of the Black Oath
Palace Siege
Bontu’s Monument[/draft]

Some utility:

[draft]Cremate
Damnation
Ashes to Ashes[/draft]

… and actually finally some lands

[draft]Bojuka Bog
Thawing Glaciers
Volrath’s Stronghold[/draft].

As well as 37 Swamps. We could have more utility lands, but this is fine.

[deck]
[commander]
Bondu the Glorified
[/commander]
[creatures]
Crypt Creeper
Disciple of Bolas
Sadistic Hypnotist
Shriekmaw
Viscera Seer
Burnished Hart
Champion of Stray Souls
Magus of the Abyss
Qarsi High Priest
Blood-Chin Fanatic
Ghoulcaller Gisa
Big Game Hunter
Gatekeeper of Malakir
Kokusho, the Evening Star
Nekrataal
Withered Wretch
Pilgrim’s Eye
Solemn Simulacrum
Liliana’s Specter
Urborg Syphon-Mage
Gray Merchant of Asphodel
Servant of Tymaret
Blood Artist
Butcher of Malakir
Falkenrath Noble
Skirsdag High Priest
Grim Haruspex
Liliana, Heretical Healer
Zulaport Cutthroat
Endrek Sahr, Master Breeder
Gravecrawler
Nether Traitor
Reassembling Skeleton
Bloodghast
Ophiomancer
Bloodsoaked Champion
Dread Wanderer
Despoiler of Souls
From Under the Floorboards
Endless Cockroaches
[/creatures]
[spells]
Ashes to Ashes
Innocent Blood
Altar’s Reap
Batterskull
Attrition
Barter in Blood
Exsanguinate
Army of the Damned
Syphon Flesh
Corpse Dance
Cremate
Grave Pact
Shadows of the Past
Dictate of Erebos
Damnation
Suffer the Past
Ob Nixilis of the Black Oath
Palace Siege
Bontu’s Monument[/spells]
[lands]
Bojuka Bog
Thawing Glaciers
Volrath’s Stronghold
37 Swamp
[/lands]
[/deck]