Deeproot Pilgrimage, Gigantoplasm, and Forensic Researcher

Prerequisites

• Deeproot Pilgrimage on the battlefield
• Gigantoplasm on the battlefield
• Forensic Researcher on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite creature tokens