Rakdos, the Muscle + Priest of Gix + Haunted Crossroads + Nylea, Keen-Eyed + Grimgrin, Corpse-Born

Rakdos, the Muscle

Priest of Gix

Haunted Crossroads

Nylea, Keen-Eyed

Grimgrin, Corpse-Born

How it works

1. Activate Grimgrin 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 Grimgrin 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 intricate loop relies on looping a mana-producing creature through your library and back to the battlefield, turning a simple sacrifice outlet into an engine for infinite resources. **Grimgrin, Corpse-Born** acts as the engine's catalyst by devouring **Priest of Gix**, which immediately refills your mana pool with three black mana upon entry. Meanwhile, **Rakdos, the Muscle** watches these sacrifices happen, turning each death into an exile trigger that fuels your hand with cards from your library. **Haunted Crossroads** ensures you never run out of ammo by slipping the priest right back to the top of your library for a single black mana, perfectly positioning it to be exiled and then cast from exile. Finally, **Nylea, Keen-Eyed** eases the economic pressure of the loop by discounting your creature spells, ensuring you generate a net positive mana advantage with every single iteration.