Deeproot Pilgrimage, Deepfathom Echo, and Forensic Researcher

Prerequisites

• Deeproot Pilgrimage on the battlefield
• Deepfathom Echo on the battlefield
• Forensic Researcher on the battlefield
• undefined

Steps

1. At the beginning of your combat phase, Deepfathom Echo triggers, causing it to explore and become a copy of Forensic Researcher until end of turn
2. Activate Forensic Researcher by tapping it, targeting Deepfathom Echo
3. Deeproot Pilgrimage triggers, creating a 1/1 Merfolk creature token
4. Resolve the Forensic Researcher ability, untapping Deepfathom Echo
5. Activate Deepfathom Echo by tapping it, targeting Forensic Researcher
6. Deeproot Pilgrimage triggers, creating a 1/1 Merfolk creature token
7. Resolve the Deepfathom Echo ability, untapping Forensic Researcher
8. Repeat from step 2

Results

• Infinite ETB
• Infinite creature tokens