Chthonian Nightmare, Priest of Gix, and Cathodion

Prerequisites

• Chthonian Nightmare on the battlefield
• Priest of Gix in the graveyard
• Cathodion on the battlefield
• You have at least three energy counters

Steps

1. Activate Chthonian Nightmare by paying , sacrificing Cathodion and returning Chthonian Nightmare from the battlefield to your hand
2. When Cathodion dies, it triggers, adding
3. Resolve the Chthonian Nightmare ability, 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
6. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get
7. Activate Chthonian Nightmare by paying , sacrificing Priest of Gix and returning Chthonian Nightmare from the battlefield to your hand, returning Cathodion from your graveyard to the battlefield
8. Cast Chthonian Nightmare by paying
9. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get
10. Repeat

Results

• Infinite black mana
• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count