Rionya, Fire Dancer + Lightning Runner

Prerequisites

• You have cast at least three instants and/or sorceries this turn.

Steps

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

Effects

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