Rakdos, the Muscle + Shambling Ghast + Haunted Crossroads + Prosper, Tome-Bound + Blasting Station

Rakdos, the Muscle

Shambling Ghast

Haunted Crossroads

Prosper, Tome-Bound

Blasting Station

How it works

1. Activate Blasting Station by tapping it and 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 Blasting Station ability, dealing 1 damage to any target.
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. When Shambling Ghast enters the battlefield, Blasting Station triggers, untapping Blasting Station.
12. Repeat.

This loop relies on a clever death-and-rebirth engine centered around Shambling Ghast, which is repeatedly sacrificed to Blasting Station to deal damage while also feeding its mana into Haunted Crossroads to loop it right back to the top of your library. From there, Rakdos, the Muscle exiles the ghast upon sacrifice so it can be cast from exile, a process neatly greased by Prosper, Tome-Bound generating extra Treasure tokens whenever you play cards from exile. The continuous cycle of casting Shambling Ghast back out triggers Blasting Station to untap itself repeatedly, completing a closed loop that deals endless damage to any target.