Agatha's Soul Cauldron, Spike Feeder, and Ajani's Pridemate

Prerequisites

• Agatha's Soul Cauldron on the battlefield
• Spike Feeder in exile
• Ajani's Pridemate on the battlefield

Steps

1. Activate Ajani's Pridemate using Spike Feeder's second ability by removing a +1/+1 counter from it, causing you to gain 2 life
2. Ajani's Pridemate triggers, putting a +1/+1 counter on itself
3. Repeat

Results

• Infinite lifegain
• Infinite lifegain triggers