Hey, I love this deck idea! Today we have another line, but very similar, using Trazyn the Infinite instead of Necrotic Ooze. Argivian Avenger can give him haste for . With Voltaic Construct and Gilded Lotus we have infinite mana. Then Staff of Nin can finish for us with infinite damage in instant speed.

I found this deck list of a demonlord belzenlok edh deck similar to the one you posted. However this guys doesn't run dread. yet somehow he was able to win 1st place at a 30 man multiplayer budget edh tournament. Here is the link. https://mtgdecks.net/Commander/demonlord-belzenlok-decklist-by-randy-mestiola-1713483. Is there any way you can explain how he prevents himself from decking out without dread? And why does he run crypt ghast and dread presence? is it simply to buffer his life to survive belzenloks dmg? It seems his strategy is to create ubound black mana with endling/cinderhaze wretch and use cackling imp. I figured he would've thought about the possibility of being interrupted but I can't seem to figure out his follow up in case that happens. Any help is appreciated thx. If not, wish you the best. Your decklist and explanations are awesome!

Higly suggesting to include in your list "The Tabernacle at Pendrell Vale" cause it's a land and can save some times. And also suggesting to add Yavimaya, because it allows to force your opponents to have forests and it also allows to produce mana with lands such as "The Tabernacle at Pendrell Vale" and "Glacial Chasm". Also suggesting to add "Grief" because it allows to see a hand of opponent before going off and removes potential interruption. And also suggest adding "Leyline of the void" cause based on that you can muligan very aggressively you can find it in your oppening hand pretty often.

do you think Null Brooch can be a good card to protect the combo?