Extravagant Replication, Skullwinder, and Time Stretch

Prerequisites

• Extravagant Replication on the battlefield
• Skullwinder on the battlefield
• Time Stretch in hand
• each other turn available

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 Skullwinder
4. When the Skullwinder token enters the battlefield, it triggers, returning Time Stretch from your graveyard to your hand
5. Repeat during your second turn

Results

• Infinite turns