Cast Ebondeath from your graveyard by paying due to Green Goblin.
When Ebondeath enters, Necroduality triggers. Holding priority, activate Phyrexian Altar by sacrificing Ebondeath, adding .
Resolve the Necroduality trigger, creating a creature token.
Activate Phyrexian Altar by sacrificing the creature token, adding .
Repeat.
This sinister loop turns Green Goblin's mechanical madness into an endless engine of resurrection and sacrifice. By transforming Norman Osborn into his alter ego, you gain the crucial cost reduction that allows Ebondeath, Dracolich to slip back onto the battlefield from your graveyard for a mere two black mana whenever a creature dies. Once Ebondeath hits the board, Necroduality instantly steps in to clone it, creating a perpetual motion machine as you feed both the original and its token copies directly into Phyrexian Altar to churn out endless mana, death triggers, and storm count.