Progenitor Mimic, Time Stretch, and Mnemonic Wall

Prerequisites

• Progenitor Mimic on the battlefield
• Time Stretch on the battlefield
• Mnemonic Wall on the battlefield
• Progenitor Mimic is a copy of Mnemonic Wall
• each turn available

Steps

1. Cast Time Stretch by paying , taking two extra turns after this one
2. At the beginning of your next upkeep, Progenitor Mimic triggers, creating a token copy of Mnemonic Wall
3. When the token Mnemonic Wall enters the battlefield, it triggers itself, returning Time Stretch from your graveyard to your hand
4. Repeat

Results

• Infinite turns