Chthonian Nightmare, Shipwreck Dowser, and Walk the Aeons

Prerequisites

• Chthonian Nightmare in hand
• Shipwreck Dowser in the graveyard
• Walk the Aeons in hand
• You control a nontoken creature with mana value 1 or less
• You have at least
• the first turn, with each extra turn available

Steps

1. Cast Walk the Aeons 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 Shipwreck Dowser from your graveyard to the battlefield
6. When Shipwreck Dowser enters the battlefield, it triggers, returning Walk the Aeons 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 Shipwreck Dowser, 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