Is Hatred-based Mono Black really better than straight-up Sui Black? Yeah, if Hatred goes unanswered you're going to take out a huge chunk of your opponent's life total (or all of it) but it seems like the whole plan rolls over to a well-placed counterspell. The concept just seems too gimmicky. I'd rather just stick with what Black does best - DISRUPTION:

Creatures (with enough disruption you really don't need that many creatures):
4 Carnophage
4 Sarcomancy
4 DARK CONFIDANT (how can you seriously not run this guy??)
4 Nantuko Shade

Spells:
4 Dark Ritual
4 Sinkhole
4 Hymn to Tourach (unarguably one of the best black cards in Magic)
4 Diabolic Edict
4 Thoughtseize
2 Cabal Therapy
2 Umezawa's Jitte

Lands:
4 Wasteland (mono-black NEEDS this card, and with Sinkhole you've got answers to stuff like Factory, which can be tough for this deck sometimes)
1 Volrath's Stronghold (lets you get a lot more mileage out of your creatures)
1 Tomb of Urami (uncounterable 5/5 flyer at instant-speed)
1 Urborg (because why not?)
13 Swamp

Sideboard:
4 Extirpate (utterly destroys decks like Solidaity, other combo)
3 Engineered Plague (invaluable against tribal decks and Empty the Warrens)
2 Pithing Needle (just a great utility card against tons of different decks)
2 Withered Wretch (some essential GY hate)
2 Duress (extra disruption against combo/control)
1 Dystopia (against Solitary Confinement, Aluren, etc.)
1 Umezawa's Jitte (if needed against Fish, Gobins, Zoo, etc.)


I know this sort of Mono-BBB deck is a lot different than Hatred-based Mono-BBB but IMO Phyrexian Negator should never be anything more than a sideboard card in either deck. Legacy is so aggro-heavy right now I have no idea why you'd ever want to run him against decks that run... well... creatures.

Also, how is Kaervek's Spite in any way better than Tomb of Urami? Urami serves the same purpose but is virtually uncounterable plus has evasion. With either card, you'd only play it when it would kill your opponent so why have to sac all your permanents and pay that much life when you don't need to? Just my thoughts anyway...