Cast Through Time, Venser, Shaper Savant, Crystal Shard, and Nexus of Fate

Prerequisites

• Cast Through Time on the battlefield
• Venser, Shaper Savant on the battlefield
• Crystal Shard on the battlefield
• Nexus of Fate in hand

Steps

1. Cast Nexus of Fate 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 Crystal Shard by tapping it and paying or , returning Venser to your hand
4. Cast Venser by paying
5. When Venser enters the battlefield, they trigger, returning the extra turn spell to your hand
6. Repeat each turn

Results

• Infinite turns