Halo Fountain, Heronblade Elite, and Forensic Researcher

Prerequisites

• Halo Fountain on the battlefield
• Heronblade Elite on the battlefield
• Forensic Researcher on the battlefield

Steps

1. Activate Heronblade Elite by tapping it, adding at least Activate Forensic Researcher by tapping it, targeting Halo Fountain
2. Holding priority, activate Halo Fountain by paying , tapping it, and untapping Forensic Researcher and Heronblade Elite, causing you to draw a card
3. Resolve the Forensic Researcher ability, untapping Halo Fountain
4. Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite creature ETB
• Near-infinite creature tokens