Medusa, Petrifying Gaze

In addition to the mana cost, sacrifice all of your creatures.
This spell can't be countered.
Deathtouch, Flash, Lifelink, Menace, Reach
{2}{b/g}{b/g}: Tap target creature target player controls. It doesn't untap at the beginning of its controller's upkeep until Medusa leaves the battlefield. Alternatively, cast this card as a sorcery with flash, paying only the mana cost above and sacrificing no creatures and use this ability on a creature. If you do this, exile Medusa, Petrifying Gaze. You may cas