Chthonian Nightmare + Priest of Gix + Skittering Precursor + Blasting Station

Chthonian Nightmare

Priest of Gix

Skittering Precursor

Blasting Station

How it works

1. Activate Blasting Station by tapping it and sacrificing Priest of Gix.
2. When Priest of Gix dies, Skittering Precursor triggers, creating a 0/1 Eldrazi Spawn creature token.
3. When the Eldrazi Spawn enters the battlefield, Blasting Station triggers, untapping Blasting Station.
4. Resolve the Blasting Station ability from step 1, dealing 1 damage to any target.
5. Activate Chthonian Nightmare by paying EEE, sacrificing the Eldrazi Spawn and returning Chthonian Nightmare from the battlefield to your hand, returning Priest of Gix from your graveyard to the battlefield.
6. When Priest of Gix enters the battlefield, it and Blasting Station trigger, adding and untapping Blasting Station.
7. Cast Chthonian Nightmare by paying 1.
8. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
9. Repeat.

This loop turns a closed-loop recycling engine into a lethal barrage by cycling Priest of Gix directly from the graveyard using Chthonian Nightmare. Every time the Priest enters, its generous mana ability provides the black mana needed to recast the Nightmare, while Skittering Precursor steps in to ensure every sacrifice leaves behind an Eldrazi Spawn token to fuel the Nightmare's energy cost. Finally, Blasting Station anchors the entire loop by using those very sacrifices to deal infinite damage to any target, all while automatically untapping itself whenever new creatures enter the battlefield.