Hi Everyone,
I'd like to share my build, which I have consecutively tested through past one year and a half. I find mono black to be the most consistent build.
4x Bloodstained Mire
2x Maze of Ith
4x Mishra's Factory
8x Swamp
1x The Tabernacle at Pendrell Vale
4x Urborg, Tomb of Yawgmoth
4x Wasteland
2x Chains of Mephistopheles
2x Cursed Scroll
3x Hymn to Tourach
3x Innocent Blood
3x Inquisition of Kozilek
2x Pox
4x Sinkhole
4x Smallpox
2x Toxic Deluge
4x Liliana of the Veil
2x Nether Spirit
2x Tombstalker
SIDEBOARD
1x Diabolic Edict (TMP)
1x Engineered Plague (7ED)
3x Ensnaring Bridge (STH)
3x Leyline of the Void (M11)
1x Massacre (NMS)
2x Nether Void (LEG)
1x Perish (TMP)
2x Pithing Needle (M10)
1x The Abyss *IT* (LEG)
1.Inclusion of fethes allows library manipulation if you draw bad cards. Also you don't have to fire them under urbrog unless necessary.
2. Mazes do a great work here. Can stop fatties, trample creatures and save your ass until you can cast a removal spell.
3. Mishars' and Wastelands are obvious.
4.The Tabernacle helps a lot against swarm decks and with overall mana denial plan it is not only limited to fighting aggro decks.
5. With so many pox spells I decided that 4 copies of urborg are necessary. Also wastelands happen.
6. Chains are great against many decks. It almost always eats a Force of Will giving way to Liliana. But is also meta dependent. But even if useless can always be sacrificed to smallpox if spirit is absent. Possilbe split like 1 Chains/ 1 Nether Void or The Abyss or 2 Nether Voids instead.
7. Scrolls are obvious but, I need to add that in my build which includes bridges it is much more of an asset. Also it helps killing specific creatures, which we lack.
8. I have cut Hymns and Inquisitions down to 3 cause too many a time they were just useless in late-game.
9. 2 copies of big Pox became a necessity due to a slow clock. Without them you have Mazes and spirits to guard you but time elapses and you do not deal sufficient amount of damage. Also helps a lot with mana denial plan but mostly it's about 1/3 of your opponent's life.
10. Full playset of sinkholes for mana denial.
11. Never enough of Smallpoxes :D. I always get Chalices and Sanctum prelatess on 2.
12. Toxic Deluge is a great mass removal. I also played BSZ but now I will always put Toxic before BSZ.
13. 4 Lillies and no need to elaborate.
14. Two Nether spirits instead of one because he is too important in this deck as a recurring blocker who stops goyfs and others and one copy was to occasional to be relied on.
15. Two Tombstalkers as game finishers. They also provide graveyard manipulation if somehow you got the second spirit in (personally I only once had this bad luck).
Sideboard is pretty stright-forward.
1. Edict against fatties like Emrakul or Marit Lage.
2. Plague against tribals.
3. Bridges against problematic match-ups like lands, show and tells/reanimators, eldrazis etc.
4. Leylines cause usually most of the decks that hate that card have little or no means at all for fighting against it.
5. Nether Voids against combo decks.
6. Pithing needle is obvious.
7. The Abyss against creature based decks.
8. Massacre and Perish are meta dependent.
This deck got me a winning place in a local tournament some time ago, ex aequo with Turbo Eldrazi. I got 2-1 against BURG,
2-1 against Manaless Dredge, 2-1 against R/G Lands and 1-0-1 against the Eldrazi.
What it lacks is grave-hate in the first game.
Any suggestions appreciated :)

