While attacking a damaged unit, this unit gets +2/+0 and gains Overwhelm.

While attacking a damaged unit, this unit gets +2/+0 and gains Overwhelm. (Deal excess damage to the opponent's base.)

Rules Clarifications:

• Shields prevent all damage from a unit with Overwhelm. There is no excess damage since the defender is not defeated.
• If the defender is defeated during an attack before combat damage is dealt, all combat damage is considered excess damage for Overwhelm.