Time Sieve, Academy Manufactor, Oboro, Palace in the Clouds, Xorn, and Tireless Provisioner

Prerequisites

• Time Sieve on the battlefield
• Academy Manufactor on the battlefield
• Oboro, Palace in the Clouds in hand
• Xorn on the battlefield
• Tireless Provisioner on the battlefield

Steps

1. Play Oboro, Palace in the Clouds
2. Oboro, Palace in the Clouds enters the battlefield, triggering Tireless Provisioner
3. In response, activate Oboro's first ability by tapping it, adding
4. Activate Oboro's last ability by paying , returning it from the battlefield to your hand
5. Resolve the Tireless Provisioner trigger, creating two Treasure, two Clue and two Food artifact tokens due to Academy Manufactor and Xorn
6. Activate Time Sieve by tapping it and sacrificing five of the artifact tokens, causing you to take an extra turn after this one
7. Repeat each turn

Results

• Infinite turns
• Lock