Mono black control with the trading post card advantage/recursion engine. I based this off of the MBC primer in the mtg salvation forums and molded it into what you see here. It's extremely powerful and fun (threw it together at the last minute last night and won my first FNM!). Specific card explanations below:
Spot removal suite: 2 ea doom blade/dismember/go for the throat. I love running a 6 spot removal suite in this deck. Most of the time I have it when I need it - whether it's spot removing the creature naya pod just played and is trying to pod after I board wiped or I'm trying to slow the early game aggro onslaught, it works.
Board wipe: 4 MB Mutilate 2 SB BSZ - mutilate is amazing - hexproof? indestructible? doesn't matter, they all bow to the power of the swamp. BSZ is also amazing for that reason, I usually side it in when I face a deck that requires more board control (like tokens).
Card advantage engine: 3 Trading Post 3 Solemn Simulacrum 2 ea mycosynth wellspring/ichor wellspring/nihil spellbomb. Ok nihil's aren't strictly card advantage, but, the way I see it, having a nihil on the board against anything with any sort of recursion or flashback (which is quite a few decks lately) is a huge positional advantage in the thumb wrestling war. I like to call it card advantage because the opponent wastes resources (mana or cards) to try to interact with their graveyard, I crack the nihil, then I pay a B and draw. Just feels like CA to me.
Mimic vat: why would I MB this you ask? Excellent question! Solemn in a vat with a trading post or phyrexia's core on the board = 2 land drops/turn and draw 2 if you use the post to sac the solemn token -- oh and peck at your opponent for 2 before you sac the solemn token. And that's just the beginning of how cute the vat is. Wurmcoil in the vat? 12 point life swing + card draw and two tokens I can keep with a post on the field? Yes please. Grave Titan in the vat - 4 2/2 zombie tokens a turn while running a 6/6 deathtouch into the opponent's face? And still, that's just the beginning - I won't even go into the 'why are you hitting yourself' comedy that is vatting your opponent's creatures. One of my favorite late game moves is to cast a Titan - board wipe - vat the titan and throw him back on the field - attack the turn he came down AND keep the 4 free 2/2 zombies (trading post food) - and, it doesn't matter the board presence my opponent had because all of his stuff was wiped. I think mimic vat deserves a 1-of in the MB just for the force multiplication it adds (that, and we can recur it should it receive hate with Trading Post/buried ruin!).
Spine of Ish Sah: this was an SB card that I decided to run MB in place of the 3rd Lilly of the Dark Realms I had in here. This is kind of the Yin to my Karn's Yang. Complete and utter board control late game, and every time I sack it (and it self recurs) I draw a card (with trading post). This also helps fill the gaps MBC has (lack of artifact and enchantment hate).
Increasing ambition/consume spirit: Yes, I know, two very different spells but to me, not really. Consume spirit saved me once and won me two separate games over a 5 round/10 game period. It's an alternate win con after I've ult'd with Lilly or even if I haven't but most of my land is on the board (which happens more often than not). The ambition is to grab the spirit OR anything else I need (spine/vat/karn/another post because the one I had received hate (as it so often does)).
Duress: This doubles as my early game "what is your hand looking like, sir?" and a "I hope you weren't planning on using that planeswalker/artifact/token producer" type of effect. I run despise in the SB to replace these against heavy aggro decks (obviously).
Mana base: Once I get to 4 land, I'm set the rest of the game. 24 feels about right to me (even though it may seem light in a 61 card control deck) because of the mycosynths/solemns/lillys and just the shear card draw power of the deck. I don't think I got land screwed once throughout the whole FNM last night.
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Exsanguinate is the consume spirit replacement. The primary difference is that it gets around any prevention spells like
Safe Passage
-- and it's great for those casual multiplayer matches (hits everyone at the same time).
I run 1ea Doom Blade/Dismember/Go For the Throat to be able to modify my 6 spot removal suite. I'll throw in a doom blade and dismember over the 2 GFTTs against naya pod. Or a GFTT and a dismember over the 2 doomblades against zombies. You get the idea.
The rest is pretty standard SB stuff. Grafdigger's Cage doesn't actually hurt us at all. We may have plenty of recursion but we're not casting anything straight from the graveyard or our decks.
That's it! Any questions/comments/criticisms are welcome!