Rakdos, the Muscle + Priest of Gix + Haunted Crossroads + Altar of Dementia + Cemetery Prowler

Rakdos, the Muscle

Priest of Gix

Haunted Crossroads

Altar of Dementia

Cemetery Prowler

How it works

1. Activate Altar of Dementia 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 Altar of Dementia 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 loop centers around an endless cycle of sacrifice and recursion, fueled by Cemetery Prowler passively discounting your black spells so that Priest of Gix can be continuously recast for less than the mana it produces. You begin by using Altar of Dementia to send Priest of Gix to the graveyard, triggering Rakdos, the Muscle to exile cards from the top of a library while simultaneously granting itself protection. Before that exile trigger resolves, Haunted Crossroads steps in to place Priest of Gix right back on top of your library, ensuring it is waiting for you to cast it anew from exile. As this engine spins infinitely, Altar of Dementia mills your opponents out, and Rakdos, the Muscle steadily digs through your entire library so you can play whatever you find.