I think there needs to be a distinctive difference between Ultimates stolen by Rubick from wish. For example, 7s Ultimate could be a difference colour or sound effect. When playing in a game today it's hard to tell whether or not it's an ally or enemy ult.
This forum is meant for concepts for new heroes, not feedback on existing heroes. It's likely the devs won't see your feedback here. Post in the Hero Gameplay forum instead.