Infinite Reflection + Lightning Runner

UR identity

Commander legal

The 2 combo pieces

• Infinite Reflection
• Lightning Runner

What must be in place

Infinite Reflection attached to Lightning Runner.
You control at least three other nontoken creatures.

How to execute it

1. Declare Lightning Runner and three other creatures as attackers, triggering each of their abilities.
2. Resolve the first Lightning Runner trigger, causing you to get {E}{E} and not pay for an additional combat phase.
3. Repeat step 2 two additional times.
4. Resolve the final Lightning Runner trigger, causing you to get {E}{E} and pay eight {E} to untap all creatures you control and to get an additional combat phase after this one.
5. Repeat each combat phase.

What the combo produces

• Infinite combat phases