Lightning Volley, Polyraptor, and Concordant Crossroads

Prerequisites

• Lightning Volley in hand
• Polyraptor on the battlefield
• Concordant Crossroads on the battlefield
• available

Steps

1. Cast Lightning Volley by paying
2. Activate Polyraptor by tapping it, dealing 1 damage to itself
3. Polyraptor triggers, creating a copy of itself
4. Repeat from step 2, using the undamaged Polyraptor instead

Results

• Infinite ETB
• Infinite tapped creature tokens