Extravagant Replication, Ardent Elementalist, and Time Stretch

Prerequisites

• Extravagant Replication on the battlefield
• Ardent Elementalist on the battlefield
• Time Stretch in hand

Steps

1. Cast Time Stretch by paying its mana cost, causing you to take two extra turns after this one
2. Move to your next turn
3. At the beginning of your upkeep, Extravagant Replication triggers, creating a token copy of Ardent Elementalist
4. When the Ardent Elementalist token enters the battlefield, it triggers, returning Time Stretch from your graveyard to your hand
5. Repeat during your second extra turn

Results

• Infinite turns