Panoptic Mirror, and Beacon of Tomorrows

Prerequisites

• Panoptic Mirror on the battlefield
• Beacon of Tomorrows in exile
• undefined

Steps

1. At the beginning of your upkeep, Panoptic Mirror triggers, casting a copy of Beacon of Tomorrows without paying its mana cost
2. Resolve Beacon of Tomorrows, causing you to take an extra turn after this one
3. Repeat each turn

Results

• Infinite turns