Chthonian Nightmare, Capture of Jingzhou, and Izzet Chronarch

Prerequisites

• Chthonian Nightmare in hand
• Capture of Jingzhou in hand
• Izzet Chronarch in the graveyard
• the first turn, with each extra turn available

Steps

1. Cast Capture of Jingzhou by paying , causing you to take an extra turn after this one
2. Move to your next 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 1 or less, and returning Chthonian Nightmare from the battlefield to your hand, returning Izzet Chronarch from your graveyard to the battlefield
6. When Izzet Chronarch enters the battlefield, it triggers, returning Capture of Jingzhou 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 Izzet Chronarch, and returning Chthonian Nightmare from the battlefield to your hand, returning a creature with mana value 1 or less from your graveyard to the battlefield
10. Repeat

Results

• Infinite turns