Chthonian Nightmare, Priest of Gix, Dark Ritual, and Skullwinder

Prerequisites

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

Steps

1. Activate Chthonian Nightmare by paying , sacrificing Skullwinder 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 Skullwinder from your graveyard to the battlefield
7. When Skullwinder 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
• Target opponent returns all cards in their graveyard to their hand