Morophon, the Boundless + Jodah, Archmage Eternal + Ebondeath, Dracolich + Altar of Dementia

Morophon, the Boundless

Jodah, Archmage Eternal

Ebondeath, Dracolich

Altar of Dementia

How it works

1. Cast Ebondeath from your graveyard by paying 0.
2. Activate Altar of Dementia by sacrificing Ebondeath, causing target player to mill cards equal to Ebondeathi's power.
3. Repeat.

This clever loop relies on Jodah, Archmage Eternal's alternative cost to cast spells for {W}{U}{B}{R}{G}, which Morophon, the Boundless then completely reduces to free when you choose Dragon as the shared creature type. With Ebondeath, Dracolich gaining the ability to be cast directly from your graveyard for zero mana whenever another creature dies, you can repeatedly sacrifice it to Altar of Dementia to mill an opponent out. Because Ebondeath itself is a Dragon, it benefits from Morophon's cost reduction while feeding its own recurring graveyard recursion indefinitely.