You may choose not to untap Giant Oyster during your untap step. {T}: For as long as Giant Oyster 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 Giant Oyster leaves the battlefield or becomes untapped, remove all -1/-1 counters from the creature.
![Giant Oyster [Time Spiral Timeshifted] MTG Single Magic: The Gathering | Multizone: Comics And Games](http://multizone.ca/cdn/shop/products/2dab7498-c574-4ea6-8dee-e3e0991af018.jpg?v=1700360427)
