Rakdos, the Muscle + Priest of Gix + Haunted Crossroads + Bartolomé del Presidio + Skittering Precursor

Rakdos, the Muscle

Priest of Gix

Haunted Crossroads

Bartolomé del Presidio

Skittering Precursor

How it works

1. Activate Bartolomé del Presidio by sacrificing Priest of Gix.
2. When Priest of Gix dies, Skittering Precursor and Rakdos trigger.
3. Resolve the Skittering Precursor trigger, creating a 0/1 Eldrazi Spawn creature token.
4. Holding priority, activate Haunted Crossroads by paying , putting Priest of Gix from your graveyard onto the top of your library.
5. 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.
6. Resolve the Bartolomé del Presidio ability from step 1, putting a +1/+1 counter on it.
7. Activate the Eldrazi Spawn by sacrificing it, adding C.
8. Cast Priest of Gix from exile by paying 3.
9. When Priest of Gix enters the battlefield, it triggers, adding .
10. Repeat.

This loop functions by recycling Priest of Gix through your graveyard, fueled by the mana it provides upon re-entering the battlefield. When you sacrifice the priest to Bartolomé del Presidio, Skittering Precursor steps in to generate an Eldrazi Spawn token, while Haunted Crossroads easily plucks the priest right back to the top of your library for a single black mana. Meanwhile, Rakdos, the Muscle capitalizes on every single sacrifice by exiling cards from your library that you can freely cast using any type of mana, eventually letting you storm off, pump Bartolomé with infinite +1/+1 counters, and exile your entire deck while looping the process indefinitely.