Cast Through Time, Venser, Shaper Savant, Sanctum of Eternity, and Time Warp

Prerequisites

• Cast Through Time on the battlefield
• Venser, Shaper Savant on the battlefield
• Sanctum of Eternity on the battlefield
• Time Warp in hand
• available each turn

Steps

1. Cast Time Warp by paying , granting you an extra turn after this one and exiling it due to rebound
2. At the beginning of your next upkeep, rebound triggers, causing you to cast the exiled spell without paying its mana cost
3. Activate Sanctum of Eternity by tapping it and paying , returning Venser from the battlefield to your hand
4. Cast Venser by paying , returning the extra turn spell to your hand
5. Repeat each turn

Results

• Infinite turns