Hag's Pot

Into the Pot — {3}, {t}: Put a -1/-1 counter on target creature. It can't attack or block and its activated abilities cannot be activated until end of turn.
As time wore on, her wild policy of self experimentation grew intolerable. She quaffed all manner of strange fungi, herbs and concoctions, intent on gaining some insight into the horror we both knew to be growing beneath us."
— the Ancestor on the Hag