Deeproot Pilgrimage, Forensic Researcher, and Omni-Changeling

Prerequisites

• Deeproot Pilgrimage on the battlefield
• Forensic Researcher on the battlefield
• Omni-Changeling on the battlefield

Steps

1. Activate Forensic Researcher by tapping it, targeting Omni-Changeling
2. Deeproot Pilgrimage triggers, creating a 1/1 Merfolk creature token
3. Resolve the Forensic Researcher ability, untapping Omni-Changeling
4. Activate Omni-Changeling by tapping it, targeting Forensic Researcher
5. Deeproot Pilgrimage triggers, creating a 1/1 Merfolk creature token
6. Resolve the Omni-Changeling ability, untapping Forensic Researcher
7. Repeat

Results

• Infinite ETB
• Infinite creature tokens