Belzenlok, Godo's Ugly Cousin (EDH / Commander)

This a one card Combo from the command zone, if not interrupted you cast Belzenlok and you win (usually turn 4).

Requirements:

• (4)(B)(B), an opponent controlling a Forest and you controlling a Swamp ,
  OR
• (4)(B)(B)(B),
  OR
  -Deal combat damage to a player with Geode Golem .

Combo:

1) Pay (4)(B)(B) to cast Demonlord Belzenlok , putting all the non-land cards from your deck to your hand. (taking at most 27 damage)
(If low on life you can have Glacial Chasm or Whip of Erebos in play to mitigate the damage)
2) Exile a black card to cast Unmask on yourself and discard Phantasmagorian.
3) Discard Skirge Familiar, Dread Return, and another card to return Phantasmagorian to your hand.
4) Cast Deepwood Legate for free.
(If nobody has a forest, you will need an additional (B), then activate Phantasmagorian enough times (holding priority) to have enough cards to delve into Sibsig Muckdraggers to pay only (B) for it)
5) Cast Hollow One for free.
6) Flash back Dread Return , sacrificing Demonlord Belzenlok, Hollow One and Deepwood Legate to return Skirge Familiar.
(I recommend casting Hollow One last because you can dodge artifact removal, since you regain priority after Hollow One resolves and sacrificing to Dread Return is a cost)
7) Use Skirge Familiar 's ability to discard 5 cards (including Skithiryx, the Blight Dragon, Cackling Imp, Grim Popper, Cinderhaze Wretch) and add (B)(B)(B)(B)(B) .
8) Pay (B)(B)(B)(B) to cast Necrotic Ooze.
(If Necrotic Ooze is countered you can cast Makeshift Mannequin or Sibsig Muckdraggers afterwards)
9) Pay (B) to give Necrotic Ooze haste (ability gained from Skithiryx, the Blight Dragon).
10) Tap Necrotic Ooze to make an opponent lose 1 life (ability gained from Cackling Imp).
11) Put a -1/-1 counter on Necrotic ooze to untap it (ability gained from Cinderhaze Wretch).
12) Target any creature other than Necrotic Ooze, remove the -1/-1 counter from Necrotic Ooze as a cost. Then, before the "Put a -1/-1 counter on another creature" resolves hold priority (ability gained from Grim Poppet).
13) With the "Put a -1/-1 counter on another creature" on the stack, repeat steps 10-13 until all your opponents are dead.

If interrupted at some point during the combo after resolving Demonlord Belzenlok you can discard Dread during the discard phase, it will go to the top of your library giving you a second shot at comboing off next turn.