Agatha's Soul Cauldron, Servant of Tymaret, and Aphetto Alchemist

Prerequisites

• Agatha's Soul Cauldron on the battlefield
• Servant of Tymaret on the battlefield
• Aphetto Alchemist in exile

Steps

1. Activate Servant of Tymaret using Aphetto Alchemist's ability by tapping it, untapping Servant of Tymaret Servant of Tymaret triggers, causing each opponent to lose 1 life and you to gain that much life
2. Repeat

Results

• Infinite lifegain
• Infinite lifegain triggers
• Infinite lifeloss