Chthonian Nightmare, Priest of Gix, Dark Ritual, and Eternal Witness

Prerequisites

• Chthonian Nightmare on the battlefield
• Priest of Gix in the graveyard
• Dark Ritual in hand
• Eternal Witness on the battlefield

Steps

1. Activate Chthonian Nightmare by paying , sacrificing Eternal Witness and returning Chthonian Nightmare from the battlefield to your hand, returning Priest of Gix from your graveyard to the battlefield
2. When Priest of Gix enters the battlefield, it triggers, adding
3. Cast Dark Ritual by paying , adding
4. Cast Chthonian Nightmare by paying
5. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get
6. Activate Chthonian Nightmare by paying , sacrificing Priest of Gix and returning Chthonian Nightmare from the battlefield to your hand, returning Eternal Witness from your graveyard to the battlefield
7. When Eternal Witness enters, it triggers, returning Dark Ritual from your graveyard to your hand
8. Cast Chthonian Nightmare by paying
9. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get
10. Repeat

Results

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