Can Gust target a 4 Might unit that has been damaged by Hextech Ray, or does the unit's Might stat need to be reduced below 4?

Ruling: Gust cannot target a 4 Might unit that has been damaged. Damage does not reduce a unit's Might stat; it only marks damage on the unit. To target a 4 Might unit with Gust, you must use an effect that reduces its Might stat (like Stupefy) to 3 or less.

Nuances:

• A unit with 4 Might and 3 damage marked is still a 4 Might unit
• Damage and Might reduction are separate mechanics
• You can buff a unit's Might in response to Gust to make it an invalid target