Can you play Gust (which targets a unit with 3 power) on Shen when he is added as a defender (when he has +2 power from his defending ability)?

Ruling: No, you cannot play Gust on Shen when he is added as a defender. Shen has 5 power the moment he arrives defending because his ability is not a triggered ability.

Nuances:

• Shen's +2 power when defending is not a triggered ability, so he immediately has 5 power when he becomes a defender, making him an invalid target for Gust which requires 3 power.