Progenitor Mimic, Time Walk, and Possessed Skaab

Prerequisites

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

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 Possessed Skaab
3. When the token Possessed Skaab enters the battlefield, it triggers itself, returning Time Walk from your graveyard to your hand
4. Repeat

Results

• Infinite turns