Does Ahri's passive work on all units on a battlefield that are attacking, or just one?

Ruling: Ahri's ability applies to all units on the battlefield, triggering individually for each one of them. When a new unit joins combat later in the showdown, Ahri's ability will trigger again for that newly joined attacker.

Sequence:

• Ahri's ability triggers during the initial when attacking/when defending chain for all units present
• If a unit joins combat later via a reaction effect, Ahri's ability triggers again specifically for that new unit
• The new trigger hops on the chain when the new unit joins

Nuances:

• The ability triggers once per unit, not once total per combat
• Units that join combat after the initial chain still cause Ahri's ability to trigger