Sandstorm Crasher, and Port Razer

Prerequisites

• Sandstorm Crasher on the battlefield
• Port Razer on the battlefield
• undefined

Steps

1. Declare Port Razer and Sandstorm Crasher as attackers, choosing to exert Sandstorm Crasher as it attacks
2. Sandstorm Crasher triggers, creating a token copy of Port Razer that is tapped and attacking
3. Deal combat damage using Port Razer, triggering Port Razer, untapping all creatures you control and causing you to get an additional combat phase after this one
4. Repeat during each combat phase

Results

• Infinite combat phases
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinite ETB
• Infinite creature tokens
• Infinite combat damage