Cast Ebondeath from your graveyard by paying due to Green Goblin.
Activate Phyrexian Altar by sacrificing Ebondeath, adding .
When Ebondeath dies, Pawn of Ulamog triggers, creating a creature token.
Activate Phyrexian Altar by sacrificing the creature token, adding .
Repeat.
This ingenious loop relies on Norman Osborn transforming into Green Goblin to drastically discount your graveyard casts, allowing you to deploy Ebondeath, Dracolich for a mere two black mana. Once Ebondeath is on the field, you can immediately sacrifice it to Phyrexian Altar to generate mana, which in turn triggers Pawn of Ulamog to produce an Eldrazi Spawn token. Sacrificing that token to the Altar provides the remaining mana needed to recast Ebondeath from the graveyard, creating a continuous, self-sustaining cycle of recursion and sacrifice.