Chthonian Nightmare + Priest of Gix + Fumulus, the Infestation + Bartolomé del Presidio

Chthonian Nightmare

Priest of Gix

Fumulus, the Infestation

Bartolomé del Presidio

How it works

1. Activate Bartolomé del Presidio by sacrificing Priest of Gix.
2. When Priest of Gix dies, Fumulus's first ability triggers, creating a 1/1 Insect creature token.
3. Resolve the Bartolomé del Presidio ability, putting a +1/+1 counter on it.
4. 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.
5. When Priest of Gix enters the battlefield, it triggers, adding .
6. Cast Chthonian Nightmare by paying 1.
7. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
8. Repeat.

This recursive loop centers around Chthonian Nightmare, which funds its own return to your hand by consuming the three energy counters it generates upon entering the battlefield. By using Bartolomé del Presidio to feed Priest of Gix to the graveyard, you trigger Fumulus, the Infestation to instantly replace the sacrificed creature with a flying Insect token that provides the necessary sacrifice fodder for Chthonian Nightmare. Each iteration yields surplus black mana from Priest of Gix's entrance while steadily growing Bartolomé del Presidio with +1/+1 counters, allowing you to drain opponents and overwhelm the board infinitely.