Muldrotha, the Gravetide, Slick Imitator, Narset's Reversal, and Time Walk

Prerequisites

• Muldrotha, the Gravetide on the battlefield
• Slick Imitator on the battlefield
• Narset's Reversal in hand
• Time Walk in hand
• You have max speed
• plus enough mana to cast the extra turn spell each turn available

Steps

1. Cast Time Walk by paying its mana cost
2. Holding priority, cast Narset's Reversal by paying , targeting Time Walk
3. Holding priority, activate Slick Imitator by paying and sacrificing it, copying Narset's Reversal, with the copy targeting the original Narset's Reversal
4. Resolve the copy of Narset's Reversal, copying the original Narset's Reversal targeting Time Walk, and returning the original Narset's Reversal to your hand
5. Resolve Time Walk, causing you to take an extra turn after this one
6. Cast Slick Imitator from your graveyard by paying
7. Repeat each turn

Results

• Infinite turns