Agatha's Soul Cauldron, Blood Researcher, and Deathbringer Thoctar

Prerequisites

• Agatha's Soul Cauldron on the battlefield
• Blood Researcher on the battlefield
• Deathbringer Thoctar in exile

Steps

1. Activate Blood Researcher by using Deathbringer Thoctar's ability by removing a +1/+1 counter from it, dealing 1 damage to any target and causing you to gain 1 life due to its lifelink
2. Blood Researcher triggers, putting a +1/+1 counter on it
3. Repeat

Results

• Infinite damage
• Infinite lifegain triggers
• Infinite lifegain