Rionya, Fire Dancer, and Lightning Runner

Prerequisites

• Rionya, Fire Dancer on the battlefield
• Lightning Runner on the battlefield
• You have cast at least three instants and/or sorceries this turn

Steps

1. At the beginning of your combat phase, Rionya triggers, creating at least four token copies of Lightning Runner with haste
2. Each Lightning Runner token enters the battlefield, triggering their abilities
3. Resolve the first Lightning Runner trigger, adding and choosing not to pay
4. Repeat step 3 until there is only one LIghtning Runner trigger remaining
5. Resolve the final Lightning Runner trigger, adding and choosing to pay eight to untap all creatures you control and get an additional combat phase after this one
6. Repeat each combat phase

Results

• Infinite combat phases
• Infinite creature tokens with haste
• Infinite ETB
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control