Mardu Siegebreaker, and Port Razer

Prerequisites

• Mardu Siegebreaker on the battlefield
• Port Razer in exile
• undefined

Steps

1. Declare Mardu Siegebreaker as an attacker, triggering its second ability, creating a token copy of Port Razer that is tapped and attacking
2. Deal combat damage with the Port Razer token, triggering its ability, untapping all creatures you control and causing you to get an additional combat phase after this one
3. Repeat each combat phase

Results

• Infinite ETB
• Infinite combat phases
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinite LTB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite combat damage
• Infinite tapped creature tokens