Rionya, Fire Dancer, and Breath of Fury

Prerequisites

• Rionya, Fire Dancer on the battlefield
• Breath of Fury on the battlefield
• Breath of Fury attached to another creature you control that can attack this turn
• You control at least one nonlegendary creature
• An opponent cannot block creatures you control

Steps

1. At the beginning of your combat phase, Rionya triggers, creating at least one token copy of any nonlegendary creature you control with haste
2. Deal combat damage to an opponent using the creature with Breath of Fury attached
3. Breath of Fury triggers, causing you to sacrifice the creature with Breath of Fury attached, then attach Breath of Fury to a creature token you control, untap all creatures you control and to get an additional combat phase after this one
4. 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