Breath of Fury, Warchanter Skald, and Concordant Crossroads

Prerequisites

• Breath of Fury on the battlefield
• Warchanter Skald on the battlefield
• Concordant Crossroads on the battlefield
• Breath of Fury attached to any other creature you control
• An opponent cannot block creatures you control
• Warchanter Skald has at least one Aura and/or Equipment attached

Steps

1. Declare Warchanter Skald and the creature with Breath of Fury attached as attackers
2. Warchanter Skald triggers, creating a 2/1 Dwarf Berserker creature token
3. Deal combat damage to an opponent using the creature with Breath of Fury attached
4. Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the Dwarf Berserker token, untap all creatures you control and to get an additional combat phase after this one
5. Repeat each combat phase

Results

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