Breath of Fury, Arclight Phoenix, and Darklight Phoenix

Prerequisites

• Breath of Fury on the battlefield
• Arclight Phoenix on the battlefield
• Darklight Phoenix on the battlefield or in the graveyard

Steps

1. At the beginning of your combat phase, if Darklight Phoenix is in your graveyard, it triggers, returning itself from your graveyard to the battlefield
2. Deal combat damage using Arclight Phoenix, triggering Breath of Fury, causing you to sacrifice Arclight Phoenix, then attach Breath of Fury to Darklight Phoenix, then causing you to untap all creatures you control and to get an additional combat phase after this one
3. Move to your next combat phase
4. At the beginning of the phase, Arclight Phoenix triggers, returning itself from your graveyard to the battlefield
5. Deal combat damage using Darklight Phoenix, triggering Breath of Fury, causing you to sacrifice Darklight Phoenix, then attach Breath of Fury to Arclight Phoenix, then causing you to untap all creatures you control and to get an additional combat phase after this one
6. Repeat

Results

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