Calamity, Galloping Inferno + Port Razer

Prerequisites

• An opponent cannot block creatures you control.

Steps

1. 1Activate Calamity's saddle ability by tapping Port Razer, causing Calamity to become saddled until end of turn.
2. 2Declare Calamity as an attacker.
3. 3Calamity triggers, creating a tapped and attacking copy of Port Razer, and repeating the process once for any nonlegendary creature that saddled Calamity this turn.
4. 4Deal combat damage using the Port Razer token(s).
5. 5Each Port Razer who has not attacked the opponent this turn triggers, causing you to untap each creature you control and to get that many additional combat phases after this one.
6. 6Repeat from step 2 each combat phase.

Effects

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