Blood-Broke Witch

Black spells you control with {b} in their
converted mana cost are replaced with {p/b}.
({p/b}can be paid with either {b} or 2 life.)
Creatures your opponent's control with power 2
or less get -1/-1 while Blood-Broke Witch is on
the battlefield.
"I paid a high price for my power but will never
be free of my debt."