Rakdos, the Muscle + Shambling Ghast + Haunted Crossroads + Prosper, Tome-Bound + Bloodflow Connoisseur

Rakdos, the Muscle

Shambling Ghast

Haunted Crossroads

Prosper, Tome-Bound

Bloodflow Connoisseur

How it works

1. Activate Bloodflow Connoisseur 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 Bloodflow Connoisseur 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 loop turns Bloodflow Connoisseur into a bottomless well of growth by recycling Shambling Ghast through your graveyard and exile. Every iteration is fueled by Haunted Crossroads putting the Ghast back on top of your library for a single black mana, which Rakdos, the Muscle then exiles using the very mana generated by the Ghast's death or by casting it. Meanwhile, Prosper, Tome-Bound acts as your economic engine, rewarding you with extra Treasure tokens every single time you cast Shambling Ghast from exile to keep the mana flowing.