Rakdos, the Muscle + Priest of Gix + Haunted Crossroads + Rakdos, Lord of Riots + Yahenni, Undying Partisan

Rakdos, the Muscle

Priest of Gix

Haunted Crossroads

Rakdos, Lord of Riots

Yahenni, Undying Partisan

How it works

1. Activate Yahenni 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 Yahenni 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 sets up an incredible engine fueled by Yahenni, Undying Partisan sacrificing Priest of Gix, which continuously triggers Rakdos, the Muscle to exile the top of your library and let you cast those cards using mana of any type. Because Priest of Gix generates {B}{B}{B} upon entering the battlefield and Haunted Crossroads effortlessly recycles it back to the top of your library for a single black mana, you have all the recursion you need. Meanwhile, the cost-reducing passive ability of Rakdos, Lord of Riots helps ensure you can easily recast your repeatedly exiled spells.