Ashley, Shadow-Possessed

Ashley's power and toughness are each equal to
your devotion to black.
At the beginning of your end step, if Ashley
attacked this turn, put a +1/+1 counter on her.
{1}{w}, {t}, Discard a card: Until end of turn,
noncreature spells you cast cost {1} less to cast.
Whenever you cast a noncreature spell this turn,
put a -1/-1 counter on Ashley.