Ultros, Obnoxious Octopus [FINAL FANTASY]

Cost: 1 U Whenever you cast a noncreature spell, if at least four mana was spent to cast it, tap target creature an opponent controls and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)
Whenever you cast a noncreature spell, if at least eight mana was spent to cast it, put eight 1/ 1 counters on Ultros.