Master Transmuter, Sewer-veillance Cam, The Great Henge, and Agatha's Soul Cauldron

Prerequisites

• Master Transmuter on the battlefield
• Sewer-veillance Cam in hand
• The Great Henge on the battlefield
• Agatha's Soul Cauldron on the battlefield

Steps

1. Activate The Great Henge by tapping it, gaining 2 life and adding which you can spend to activate Master Transmuter due to Agatha's Soul Cauldron
2. Activate Master Transmuter by paying , tapping it, and returning The Great Henge from the battlefield to your hand, putting Sewer-veillance Cam from your hand onto the battlefield
3. When Sewer-veillance Cam enters, it triggers, allowing you to untap Master Transmuter
4. Activate Master Transmuter by paying , tapping it, and returning Sewer-veillance Cam from the battlefield to your hand, putting The Great Henge from your hand onto the vattlefield
5. When Sewer-veillance Cam leaves the battlefield, it triggers, allowing you to untap Master Transmuter
6. Repeat

Results

• Infinite lifegain
• Infinite lifegain triggers