Chthonian Nightmare, Walk the Aeons, and The Immortal Weapons

Prerequisites

• Chthonian Nightmare in hand
• Walk the Aeons in hand
• The Immortal Weapons in the graveyard
• the first turn, with each extra turn available

Steps

1. Cast Walk the Aeons by paying its mana cost, 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 The Immortal Weapons from your graveyard to the battlefield
6. When The Immortal Weapons 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 The Immortal Weapons, 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
• Lock