Rakdos, the Muscle + Shambling Ghast + Haunted Crossroads + Birgi, God of Storytelling // Harnfel, Horn of Bounty + Umbral Collar Zealot

Rakdos, the Muscle

Shambling Ghast

Haunted Crossroads

Birgi, God of Storytelling // Harnfel, Horn of Bounty

Umbral Collar Zealot

How it works

1. Activate Umbral Collar Zealot by sacrificing Shambling Ghast.
2. When Shambling Ghast dies, it and Rakdos trigger.
3. Resolve the Shambling Ghast trigger, creating a Treasure token.
4. Activate the Treasure by tapping and sacrificing it, adding .
5. Holding priority, activate Haunted Crossroads by paying , putting Shambling Ghast from your graveyard onto the top of your library.
6. Resolve the Rakdos trigger, exiling Shambling Ghast from the top of your library with the ability to cast it until your next turn.
7. Resolve the Umbral Collar Zealot ability
8. Cast Shambling Ghast from exile by paying 1.
9. Birgi triggers, adding .
10. Repeat.

This clever loop revolves around Rakdos, the Muscle acting as a sacrifice outlet while its triggered ability exiles Shambling Ghast whenever it hits the graveyard. By using Umbral Collar Zealot to sacrifice the Ghast, you trigger its death ability to create a Treasure token, which then funds Haunted Crossroads to loop the Ghast right back to the top of your library where Rakdos can exile it. Meanwhile, Birgi, God of Storytelling transforms your repeated casting of the Ghast from exile into a net-positive mana engine, ensuring you have all the red and black mana you need to sustain the entire loop indefinitely.