Cryotheory Adept
{1}{U}Creature — Human Wizard
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) {3}{U}, Exile this card from your graveyard: Tap target creature and put a stun counter on it. Activate only as a sorcery. (If a permanent with a stun counter would become untapped, remove one from it instead.)