Shahela, Thunder Mistress

Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever this card gets +1/+1 for its own ability, Shahela, Thunder Mistress deals 2 damage up to
three target creatures.
When this creature dies return all the spells that triggered this effect in your library, shuffle your library.