Does Yasuo deal 6 or 5 damage when attacking if Stupefy is used on him?

Ruling: Yasuo deals damage equal to his current might, whatever that might may be at the time his ability resolves.

Nuances:

• Stupefy must be used before Yasuo's ability resolves to affect the damage dealt
• The timing of when Stupefy is used determines Yasuo's might value when his ability calculates damage