Progenitor Mimic, Notorious Throng, and Timeless Witness

Prerequisites

• Progenitor Mimic on the battlefield
• Notorious Throng in hand
• Timeless Witness on the battlefield

Steps

1. Deal combat damage to an opponent using a Rogue
2. Cast Notorious Throng for its prowl cost by paying , taking an extra turn after this one
3. At the beginning of your next upkeep, Progenitor Mimic triggers, creating a token copy of Timeless Witness
4. When the token Timeless Witness enters the battlefield, it triggers itself, returning Notorious Throng from your graveyard to your hand
5. Repeat

Results

• Infinite turns