Rakdos, the Muscle + Priest of Gix + Haunted Crossroads + Helm of Awakening + Yahenni, Undying Partisan

Rakdos, the Muscle

Priest of Gix

Haunted Crossroads

Helm of Awakening

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 2.
7. When Priest of Gix enters the battlefield, it triggers, adding .
8. Repeat.

This clever loop relies on Helm of Awakening to discount the cost of recasting Priest of Gix to just two generic mana, which is easily covered by the three black mana generated when it enters the battlefield. By using Yahenni, Undying Partisan as your sacrifice outlet, you repeatedly trigger Rakdos, the Muscle to exile your library while using Haunted Crossroads to seamlessly cycle the Priest right back to the top of your deck.