Chthonian Nightmare + Priest of Gix + Fumulus, the Infestation + Ashnod's Altar

Chthonian Nightmare

Priest of Gix

Fumulus, the Infestation

Ashnod's Altar

How it works

1. Activate Ashnod's Altar by sacrificing Priest of Gix, adding CC.
2. When Priest of Gix dies, Fumulus's first ability triggers, creating a 1/1 Insect creature token.
3. Activate Chthonian Nightmare by paying EEE, sacrificing the Insect and returning Chthonian Nightmare from the battlefield to your hand, returning Priest of Gix from your graveyard to the battlefield.
4. When Priest of Gix enters the battlefield, it triggers, adding .
5. Cast Chthonian Nightmare by paying 1.
6. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
7. Repeat.

This ingenious loop turns a modest investment of energy into a self-sustaining engine of dark resurrection and profit. By leveraging Ashnod's Altar to sacrifice Priest of Gix for colorless mana, you fuel the mana requirement while sending the priest to the graveyard, where Chthonian Nightmare can pluck it right back out. Meanwhile, the watchful presence of Fumulus, the Infestation ensures that every sacrifice leaves behind a sacrificial Insect token to pay the Nightmare's energy and creature-sacrifice costs, transforming a simple recursive loop into an unstoppable harvest of infinite mana and triggers.