This deck makes wonderful use of Morbid, Devotion and sac outlets to fuel an army of freshly summoned demons.
This deck is currently part of a contest over at East Coast Commander, I am currently 21 votes shy of 1st place.
http://eastcoastcommander.com/2014/03/02/christmas-february-let-voting-begin/
Voting would be greatly appreciated :)
This deck has a few blatant combos in it, and a couple not so obvious.
1) 6 Shadowborn Apostle + Rune-Scarred Demon + Shirei, Shizo's Caretaker. Once Shirei is in play, get 6 shadowborn in play and you have yourself an infinite demon tutor engine.
2) 6 Shadowborn Apostle + Vampiric Tutor + Shirei, Shizo's Caretaker + Blood Aritst. If you can get Shirei in play while you have your initial six shadowborn in play, tutor out Blood Artist and watch the infinite damage pile up.
3) Urborg, Tomb of Yawgmoth + Cabal Coffers + Caged Sun. Urborg and Coffers is so blatant and so well worn its not even fun anymore, lets fix this by adding Caged Sun. Caged Sun will double the amount of mana Cabal Coffers can produce, which makes for already great EDH cards such as Exsanguinate, and/or Demonfire, Balefire, Consume Spirit or Drain Life for 1vs1.
4) Mimic Vat + Thrumming Stone + Shadowborn Apostle + Rune-Scarred Demon + Damnation + Patriarch's Bidding + Blood Artist + Void. Thrum through your deck pulling Apostle after Apostle, while you have then sac 6 for the rune-scarred demon. With Rune-Scarred Demon, tutor Patriarch's Bidding, then play Damnation, destroying everything, imprint the Rune-Scarred to the Mimic Vat, next turn, play Patriarch's Bidding bringing all of your Apostles back, vat the demon, tutor blood artist, play blood artist, next turn, vat the demon again, tutor void, play void, choose 1 as your number, boom 29 damage. This combo looks like it requires lots of luck to pull off, but the only cards you need to physically draw off of luck is:
1) Mimic Vat
2) Thrumming Stone
3) 2 Shadowborn Apostles (Extra Thrumming incase first one reveals nothing)
4) Damnation
This deck has tonnes of Mana acceleration, plenty of thinning to help draw stuff, and of course plenty of abilities to tutor stuff out. I have pulled this combo off a few times by turn 6.
_____________________________________________________________________________
Abhorrent Overlord will be added into this deck somehow once he is released. He is not an early game creature by any means, he is meant to be held of for a few turns while you fill the field with black symbols, the drop the bomb for all the extra bodies and creatures you'll have to sac as an outlet to demon drawbacks.
Skirsdag High Priest is here because nearly every turn after he is in play, something is going to be dying, meaning a few 5/5 demon tokens will be hitting the field making great use of the Morbid ability on both him and Reaper of the Abyss.
If Shirei isn't enough Shadowborn reanimation for you, I highly recommend dropping that Patriarch's bidding, and bringing every suicidal Shadowborn Apostle back from the graveyard for some endless sac outlets, if you are about to win and need that extra boost, or just want to go for overkill, Patriarch Bidding can bring back all your demons that just weren't evil enough to stay on the field.