Progenitor Mimic, Temporal Manipulation, and Shipwreck Dowser

Prerequisites

• Progenitor Mimic on the battlefield
• Temporal Manipulation on the battlefield
• Shipwreck Dowser on the battlefield

Steps

1. Cast Temporal Manipulation 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 Shipwreck Dowser
3. When the token Shipwreck Dowser enters the battlefield, it triggers itself, returning Temporal Manipulation from your graveyard to your hand
4. Repeat

Results

• Infinite turns