Rakdos, the Muscle + Priest of Gix + Haunted Crossroads + Semblance Anvil + Yahenni, Undying Partisan

Rakdos, the Muscle

Priest of Gix

Haunted Crossroads

Semblance Anvil

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 1.
7. When Priest of Gix enters the battlefield, it triggers, adding .
8. Repeat.

This intricate loop transforms a simple loop of sacrifices into an engine that generates infinite black mana and lets you exile and play your entire library. Semblance Anvil does the heavy lifting by reducing the casting cost of creatures, allowing you to replay your exiled threats for next to nothing. By sacrificing Priest of Gix to Yahenni, Undying Partisan, you trigger Rakdos, the Muscle to exile cards while simultaneously using Haunted Crossroads to loop the Priest right back to the top of your library. As the Priest re-enters from exile, its mana ability funds the entire operation, turning a cascade of sacrifices into an unstoppable engine of endless black mana and infinite triggers.