When Gust targets a unit that becomes invalid during chain resolution (due to increased might), can the player change the target to a different valid unit?

Ruling: No, once targets are declared upon entering the chain, they cannot be redeclared. Gust will resolve with no effect if its target becomes invalid.

Sequence:

• Player declares target when playing Gust and adding it to the chain
• If the target becomes invalid during resolution (e.g., might increases above 4), the target cannot be changed
• Gust resolves with no effect