Obseshoda, Truly Disciplined

Flash
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever Obseshoda, Truly Disciplined triggers prowess, you may put a first strike counter on
target creature you control. Then, if you control
five or more creatures with a first strike counter
on them, you may put a double strike counter on
Obseshoda.