Chthonian Nightmare + Greedy Freebooter + Shambling Ghast + Cemetery Prowler

Chthonian Nightmare

Greedy Freebooter

Shambling Ghast

Cemetery Prowler

How it works

1. Cast Chthonian Nightmare by paying .
2. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
3. Activate Chthonian Nightmare by paying E, sacrificing Greedy Freebooter and returning Chthonian Nightmare from the battlefield to your hand.
4. When Greedy Freebooter dies, it triggers, causing you to scry 1 and create a Treasure token.
5. Resolve the Chthonian Nightmare ability, returning Shambling Ghast from your graveyard to the battlefield.
6. Activate the Treasure by tapping and sacrificing it, adding .
7. Cast Chthonian Nightmare by paying .
8. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
9. Activate Chthonian Nightmare by paying E, sacrificing Shambling Ghast and returning Chthonian Nightmare from the battlefield to your hand.
10. When Shambling Ghast dies, it triggers, creating a Treasure token.
11. Resolve the Chthonian Nightmare ability, returning Greedy Freebooter from your graveyard to the battlefield.
12. Activate the Treasure by tapping and sacrificing it, adding .
13. Repeat.

This clever recursive loop leverages Chthonian Nightmare as a repeatable engine that continuously recycles your graveyard by paying its low energy cost and returning itself to your hand. To fund this loop indefinitely, Greedy Freebooter and Shambling Ghast act as sacrificial fodder that generate Treasure tokens upon death, providing the exact black mana needed to recast the enchantment each cycle. Meanwhile, Cemetery Prowler quietly lurks on the battlefield, providing valuable passive utility and graveyard hate while you churn through your looping threats.