Riku of Two Reflections, Narset's Reversal, and Beacon of Tomorrows

Prerequisites

• Riku of Two Reflections on the battlefield
• Narset's Reversal in hand
• Beacon of Tomorrows in hand
• each turn available

Steps

1. Cast Beacon of Tomorrows by paying
2. Riku's first ability triggers - choose not to pay
3. Holding priority, cast Narset's Reversal by paying , targeting Beacon of Tomorrows
4. Riku's first ability triggers, causing you to pay to copy Narset's Reversal, with the copy targeting the original Narset's Reversal
5. Resolve the copy of Narset's Reversal, copying the original Narset's Reversal targeting Beacon of Tomorrows, and returning the original Narset's Reversal to your hand
6. Resolve the copy of Narset's Reversal created in step 5, copying Beacon of Tomorrows and returning the original Beacon of Tomorrows to your hand
7. Resolve Beacon of Tomorrows, causing you to take an extra turn after this one
8. Repeat each turn

Results

• Infinite turns