Breath of Fury, Lavaleaper, and Precinct Captain

Prerequisites

• Breath of Fury on the battlefield
• Lavaleaper on the battlefield
• Precinct Captain on the battlefield

Steps

1. Deal combat damage using the creature that has Breath of Fury attached and Precinct Captain, triggering Breath of Fury and Precinct Captain
2. Resolve the Precinct Captain trigger, creating a creature token
3. Resolve the Breath of Fury trigger, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to a creature token, then causing you to untap all creatures you control and to get an additional combat phase after this one
4. Repeat each combat phase

Results

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