Old one card combo Demonlord Belzenlok (EDH / Commander)

This a one card Combo from the command zone, if not interrupted you cast Belzenlok and you win (usually turn 4). This deck is heavily inspired from this list: https://www.mtggoldfish.com/deck/1037100#paper. This is how it works:

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:

-Pay (4)(B)(B) to cast Demonlord Belzenlok , putting all the non-land cards from your deck to your hand. (taking at most 25 damage)
(If low on life you can have Glacial Chasm, Whip of Erebos , Deadly Wanderings or Homicidal Seclusion in play to mitigate the damage)
-Exile a black card to cast Unmask on yourself and discard Phantasmagorian.
-Discard Skirge Familiar, Dread Return, and another card to return Phantasmagorian to your hand.
-Cast Deepwood Legate for free.
(If nobody has a forest, you will need an additional (B), then Snuff Out/Soul Spike to kill a creature and cast Bone Picker for (B) or activate Phantasmagorian twice (holding priority) to have enough cards to delve into Sultai Scavenger to pay only (B) for it)
-Cast Hollow One for free.
-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)
-Use Skirge Familiar 's ability to discard 6 cards (including Mikaeus, the Unhallowed and Triskelion ) and add (B)(B)(B)(B)(B)(B) .
-Pay (B)(B)(B)(B)(B)(B) to cast Ever After, reanimating Mikaeus, the Unhallowed and Triskelion.
(If Ever After is unavailable/countered you can cast Living Death instead)
-Have Triskelion deal one damage to Mikaeus, the Unhallowed, then two to itself.
(I recommend dealing the 1st damage to Mikaeus, the Unhallowed , so that you can kill it with Soul Spike in response to exile cards such as Path to Exile )
-It comes back with undying, deal two damage to an opponent, then two to itself.
-Repeat until you win.
(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)