Riiastra, Exiled Aggressor

Flying (This creature can't be blocked except by creatures with flying and/or reach.)
Whenever you cast a noncreature spell, Riiastra, Exiled Aggressor gets +1/+0 until end of turn, then you have it fight target creature.
"This war cannot be won by sheer force sister - be gone! I shall not allow you to compromise my position."
- Alhammarret, High Arbiter