Agatha's Soul Cauldron, Famished Paladin, and Ezzaroot Channeler

Prerequisites

• Agatha's Soul Cauldron on the battlefield
• Famished Paladin on the battlefield
• Ezzaroot Channeler in exile

Steps

1. Activate Famished Paladin using Ezzaroot Channeler's ability by tapping it, causing you to gain 2 life
2. Famished Paladin triggers, untapping itself
3. Repeat

Results

• Infinite lifegain
• Infinite lifegain triggers