Unnatural Aggression

If a card loses devoid, it will still be colorless. This is because effects that change an object’s color (like the one created by devoid) are considered before the object loses devoid.

If the creature an opponent controls survives the fight but would die later in the turn for another reason, it will be exiled instead, whether your creature dealt it damage or not.

If the creature you control becomes an illegal target (perhaps due to being destroyed by another spell or ability), Unnatural Aggression will resolve, but the target creature an opponent controls will neither deal nor receive any damage. If that creature would die later in the turn for another reason, it will be exiled instead.