Kogla, the Titan Ape

If the target Human is an illegal target by the time Kogla's last ability tries to resolve, the ability won't resolve. Kogla won't gain indestructible.

If the target creature is an illegal target when Kogla's first ability tries to resolve, the ability doesn't resolve. If it's a legal target but Kogla is no longer on the battlefield when the ability resolves, the target creature won't deal or be dealt damage.