River Song, Conjurer's Bauble, Saheeli, the Sun's Brilliance, and Time Stretch

Prerequisites

• River Song on the battlefield
• Conjurer's Bauble on the battlefield
• Saheeli, the Sun's Brilliance on the battlefield
• Time Stretch in hand
• each other turn available

Steps

1. Activate Saheeli by paying and tapping it, creating a token copy of Conjurer's Bauble
2. Cast Time Stretch by paying , causing you to take two extra turns after this one
3. Activate the Conjurer's Bauble token by tapping and sacrificing it, putting Time Stretch onto the bottom of your library from your graveyard, and then causing you to draw Time Stretch from the bottom of your library due to River Song
4. Repeat each other turn

Results

• Infinite turns