Progenitor Mimic, Time Walk, and Vampire Charmseeker

Prerequisites

• Progenitor Mimic on the battlefield
• Time Walk on the battlefield
• Vampire Charmseeker on the battlefield
• Enough mana available to cast the extra turn spell each turn
• Progenitor Mimic is a copy of Vampire Charmseeker

Steps

1. Cast Time Walk by paying its mana cost, taking an extra turn after this one
2. At the beginning of your next upkeep, Progenitor Mimic triggers, creating a token copy of Vampire Charmseeker
3. When the token Vampire Charmseeker enters the battlefield, it triggers itself, returning Time Walk from your graveyard to your hand
4. Repeat

Results

• Infinite turns