Thassa, Deep-Dwelling, Eternal Witness, and Temporal Manipulation

Prerequisites

• Thassa, Deep-Dwelling on the battlefield
• Eternal Witness on the battlefield
• Temporal Manipulation in hand
• each turn available

Steps

1. Cast Temporal Manipulation by paying , getting an extra turn after this one
2. At the beginning of your end step, Thassa triggers, blinking Eternal Witness
3. Eternal Witness enters the battlefield, returning Temporal Manipulation from your graveyard to your hand
4. Repeat

Results

• Infinite turns