Rakdos, the Muscle + Priest of Gix + Haunted Crossroads + Umori, the Collector + Carrion Feeder

Rakdos, the Muscle

Priest of Gix

Haunted Crossroads

Umori, the Collector

Carrion Feeder

How it works

1. Activate Carrion Feeder 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 Carrion Feeder ability from step 1, putting a +1/+1 counter on it.
6. Cast Priest of Gix from exile by paying 2.
7. When Priest of Gix enters the battlefield, it triggers, adding .
8. Repeat.

This loop revolves around recasting Priest of Gix from exile while using Haunted Crossroads to seamlessly loop it right back to the top of your library in response to Rakdos, the Muscle's exile trigger. Umori, the Collector quietly does heavy lifting in the background, lowering the casting cost so the mana generated by the Priest's entry easily fuels the entire operation. Meanwhile, Carrion Feeder acts as the designated sacrifice outlet, growing steadily larger with infinite +1/+1 counters while letting Rakdos continuously strip away your opponent's library for free value.