Riku of Two Reflections, Narset's Reversal, and Time Stretch

Prerequisites

• Riku of Two Reflections on the battlefield
• Narset's Reversal in hand
• Time Stretch in hand
• each other turn available

Steps

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

Results

• Infinite turns