Giant Oyster
{2}{U}{U}
Creature -- Oyster
0/3
You may choose not to untap ~this~ during your untap step.
{T}: For as long as ~this~ remains tapped, target tapped creature doesn't untap during its controller's untap step, and at the beginning of each of your draw steps, put a -1/-1 counter on that creature. When ~this~ leaves the battlefield or becomes untapped, remove all -1/-1 counters from the creature.