Extravagant Replication, Mnemonic Wall, and Time Stretch

Prerequisites

• Extravagant Replication on the battlefield
• Mnemonic Wall 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 first extra turn
3. At the beginning of your upkeep, Extravagant Replication triggers, creating a token copy of Mnemonic Wall
4. When the Mnemonic Wall 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