Aurelia, the Warleader, and Rionya, Fire Dancer

Prerequisites

• Aurelia, the Warleader on the battlefield
• Rionya, Fire Dancer on the battlefield
• An opponent is unable to block and kill creatures you control

Steps

1. At the beginning of your combat phase, Rionya triggers, creating at least one token copy of Aurelia
2. Put all but one Aurelia into your graveyard due to the legend rule, ensuring the remaining Aurelia has not attacked this turn
3. Declare the remaining Aurelia as an attacker
4. Aurelia triggers, untapping all creatures you control and causing you to get an additional combat phase after this one
5. Repeat each combat phase

Results

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