Rakdos, the Muscle + Priest of Gix + Haunted Crossroads + Altar of Dementia + Ezzaroot Channeler

Rakdos, the Muscle

Priest of Gix

Haunted Crossroads

Altar of Dementia

Ezzaroot Channeler

How it works

1. Activate Altar of Dementia by sacrificing Priest of Gix.
2. When Priest of Gix dies, Rakdos triggers.
3. Holding priority, activate Haunted Crossroads by paying , putting Priest of Gix from your graveyard onto the top of your library.
4. Resolve the Rakdos trigger, causing you to exile the top three cards of your library with the ability to play them until your next end step.
5. Resolve the Altar of Dementia ability from step 1.
6. Cast Priest of Gix from exile by paying at most 2.
7. When Priest of Gix enters the battlefield, it triggers, adding .
8. Repeat.

This loop transforms the mana from Priest of Gix into an engine of continuous value by turning the graveyard into an extension of your hand. When you sacrifice Priest of Gix to Altar of Dementia, Rakdos, the Muscle triggers to exile cards from the top of a library while Haunted Crossroads neatly places the priest back on top to be recast. Meanwhile, Ezzaroot Channeler's life-gaining taps and cost-reduction ability ensure you can always afford to replay the priest, ultimately generating infinite black mana, infinite storm, and an entire library milled away or exiled to play at your leisure.