Cast Ebondeath from your graveyard by paying due to Green Goblin.
Activate Phyrexian Altar by sacrificing Ebondeath, adding .
When Ebondeath dies, The Skullspore Nexus triggers, creating a creature token.
Activate Phyrexian Altar by sacrificing the creature token, adding .
Repeat.
This clever loop uses Norman Osborn // Green Goblin transformed as the engine, leveraging its static cost reduction and Goblin Formula to let you cast Ebondeath, Dracolich straight from your graveyard. Once Ebondeath enters and hits the battlefield, you can sacrifice it to Phyrexian Altar to generate mana, which triggers The Skullspore Nexus to create a powerful Fungus Dinosaur token in its place. You then sacrifice that newly created token back to Phyrexian Altar for another mana, fueling an endless cycle of deaths and sacrifices.