Does Irelia's ability trigger when you choose a friendly unit for an Equipment card's Equip ability?

Ruling: Yes, Irelia's ability triggers when you use an Equip action because the Equip action requires choosing a friendly unit as a target.

Nuances:

• Any effect that requires you to choose/target a friendly unit will trigger Irelia's ability
• The Equip action specifically requires a friendly target, which satisfies Irelia's trigger condition