Breath of Fury, Adeline, Resplendent Cathar, and Concordant Crossroads

Prerequisites

• Breath of Fury on the battlefield
• Adeline, Resplendent Cathar on the battlefield
• Concordant Crossroads on the battlefield
• An opponent cannot block creatures you control

Steps

1. Declare the creature with Breath of Fury attached as an attacker
2. Adeline triggers, creating a 1/1 Human creature token tapped and attacking each opponent
3. Deal combat damage using the creature that has 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 a Human token, then causing you to 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 LTB
• Infinite mana creatures you control can produce
• Infinite sacrifice triggers
• Infinite untap of creatures you control
• Near-infinite creature tokens with haste