Darkness Fighter

Level up {r/w}{w/u} ({r/w}{w/u} : Put a level counter on this.
Level up only as a sorcery.)
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
{1}{u}{r}{w}: Target instant or sorcery from your graveyard with converted mana cost equal or less
to this creature level counters gains flashback.
It can't be countered.