Thassa, Deep-Dwelling, Eternal Witness, and Time Walk

Prerequisites

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

Steps

1. Cast Time Walk 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 Time Walk from your graveyard to your hand
4. Repeat

Results

• Infinite turns