Rakdos, the Muscle + Shambling Ghast + Haunted Crossroads + Prosper, Tome-Bound + Carrion Feeder

Rakdos, the Muscle

Shambling Ghast

Haunted Crossroads

Prosper, Tome-Bound

Carrion Feeder

How it works

1. Activate Carrion Feeder 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 Carrion Feeder ability, putting a +1/+1 counter on it.
8. Cast Shambling Ghast from exile by paying 1.
9. Prosper triggers, creating a Treasure token.
10. Activate the Treasure by tapping and sacrificing it, adding 1.
11. Repeat.

This clever loop uses Carrion Feeder as the sacrifice outlet to send Shambling Ghast straight to the graveyard, where Haunted Crossroads can recycle it back onto the top of your library for a single black mana. Rakdos, the Muscle turns that sacrifice into card advantage by exiling Shambling Ghast from the library, allowing you to recast it and fuel Prosper, Tome-Bound's Pact Boon ability to continually generate the mana needed to sustain the chain. As an added bonus, Prosper's mystic arcanum and Rakdos's exile triggers help you card-advantage your way through the rest of your deck while your Carrion Feeder grows infinitely large.