Mistress of Dark Magic

{t}: Add one mana of any colour.
{4}{b}{g}: Put a -1/-1 counter on each creature opponents control.
Dark Magic (You may activate this creatures active abilities from the graveyard buy paying an extra cost
of sacrificing a creature or discarding a card.
Creatures in graveyards don't need to be tapped as activating cost. If you do, exile this card at the end of
turn.)