Gifts of Dementia

Exile all creature cards from your graveyard.
Put a -1/-1 counter on target creature for
each card you own in exile.
''Tana... you better head off. The voices, once again, call for hunt. My voices, the voices...
Tana, Tana, let me behold thy eyes.''
— Elra to her daughter, deep within the Cave
of Temptation