Can Gust still affect units that have been pumped above 3 might (e.g., via En Garde as a reaction)?

Ruling: No, Gust cannot affect units that have been pumped above 3 might. When Gust resolves, if the unit is no longer 3 might or less, the spell whiffs and nothing happens.

Nuances:

• The spell still counts as played for triggers like Student, even though it whiffs