Riegan, the Black Beast

Reach, ward {2}
Whenever a creature dies as a result of the
damage dealt by Riegan, the Black Beast, put a
+1/+1 counter on it. Then if there are five or
more +1/+1 counters on it, remove those
counters, untap it and transform it.
{b/r}, {t}: Riegan, the Black Beast fights target
creature you don't control.