Breath of Fury, Tana, the Bloodsower, and Fervor

Prerequisites

• Breath of Fury on the battlefield
• Tana, the Bloodsower on the battlefield
• Fervor on the battlefield

Steps

1. Deal combat damage with Tana and the creature that has Breath of Fury attached
2. Tana and Breath of Fury triggers
3. Resolve the Tana trigger, creating a number of 1/1 Saproling creature tokens equal to the damage Tana dealt
4. Resolve the Breath of Fury trigger, causing you to sacrifice the creature it is attached to, attach Breath of Fury to a Saproling token, untap all creatures you control and get an additional combat phase after this one
5. Repeat
6. Deal combat damage using the creature that has Breath of Fury attached and Tana, triggering Breath of Fury and Tana
7. Resolve the Tana trigger, creating at least one creature token
8. 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
9. Repeat each combat phase

Results

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