Moff Gideon - Formidable Commander

Effect

Action [Exhaust]: Attack with a unit that costs 3 or less. If it's attacking a unit, it gets +1/+0 for this attack.
[Deployed Leader Unit]
Overwhelm (When attacking an enemy unit, deal excess damage to the opponent's base.)
Each friendly unit that costs 3 or less gets +1/+0 and gains Overwhelm while attacking an enemy unit.