Chthonian Nightmare, Time Stretch, and Coati Scavenger

Prerequisites

• Chthonian Nightmare in hand
• Time Stretch in hand
• Coati Scavenger in the graveyard
• the first turn, with each other extra turn available

Steps

1. Cast Time Stretch by paying , causing you to take two extra turns after this one
2. Move to your second extra turn
3. Cast Chthonian Nightmare by paying
4. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get
5. Activate Chthonian Nightmare by paying , sacrificing a creature with mana value 2 or less, and returning Chthonian Nightmare from the battlefield to your hand, returning Coati Scavenger from your graveyard to the battlefield
6. When Coati Scavenger enters the battlefield, it triggers, returning Time Stretch from your graveyard to your hand
7. Cast Chthonian Nightmare by paying
8. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get
9. Activate Chthonian Nightmare by paying at most , sacrificing Coati Scavenger, and returning Chthonian Nightmare from the battlefield to your hand, returning a creature with mana value 2 or less from your graveyard to the battlefield
10. Repeat

Results

• Infinite turns