This is a crazy, noisy, combo town! (EDH / Commander)

This is a Jojo reference (not really, but Jojo rocks).

We have two types of combo here: with Doomsday and without Doomsday. We can also win if we get the right pieces from the Doomsday pile in our hand, but that is more unlikely.

Okay, so first we have the Doomsday way of living. Piles are from top to bottom, and we will need a cycler in our hand or a cantrip: Razaketh's Rite, Scarab Feast or Cremate. The piles:

• First pile: Reprocess -> Sacrifice -> Animate Dead -> Aetherflux Reservoir -> Leshrac's Sigil. For this pile is important to have K'rrik in play and use Sacrifice on him, and let him go to the graveyard so you can use Animate Dead later on.
• Second pile, the Bola's pile: Bola's Citadel -> Zuran Orb -> Aetherflux Reservoir -> Tormod's Crypt -> Leshrac's Sigil. Here we can exchange both 0 cost artifacts for the classic Carrion Feeder + Gravecrawler. Also, you can use any 0 cost artifact for the second one, I just think Tormod's Crypt is useful on it's own.

If you search a bit about mono black Doomsday you will see that these are not the usual piles, usually it goes: Ransack the Lab -> Mikaeus, the Unhallowed -> Triskelion -> Dusk Legion Zealot -> Victimize, but I don't have the money for Mikaeus, the Unhallowed. I only want to proxy either Gravecrawler or Mikaeus, the Unhallowed, and Gravecrawler gives us more combos and different piles.

Now to the man, the myth, the legend, Gary, the Unstopable, also known as Gray Merchant of Asphodel. This guy is a beast and will be the center piece of our other combo:

-First we need Buried Alive, a reanimation spell (Animate Dead or Vicimize + a random creature), and we need our boy K'rrik, Son of Yawgmoth. With Buried Alive we bin in the graveyard Chainer, Dementia Master, Gray Merchant of Asphodel and a sac outlet (Carrion Feeder or Viscera Seer). Then we reanimate Chainer, and use his abillity to welcome back Gary, which drains everyone and gives us plenty of health. Use Chainer again on our sac outlet and go to town sacrificing Gary and bringing him back with Chainer. You need at least two more enemies or another black symbol in play, because looping cost 9 life and Gary gives us only 8, per opponent, with this number of permanents.