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.
Merieke Ri Berit
{W}{U}{B}
Legendary Creature -- Human
1/1
~this~ doesn't untap during your untap step.
{T}: Gain control of target creature for as long as you control ~this~. When ~this~ leaves the battlefield or becomes untapped, destroy that creature. It can't be regenerated.
Tawnos's Coffin
{4}
Artifact
You may choose not to untap ~this~ during your untap step.
{3}, {T}: Exile target creature and all Auras attached to it. Note the number and kind of counters that were on that creature. When ~this~ leaves the battlefield or becomes untapped, return that exiled card to the battlefield under its owner's control tapped with the noted number and kind of counters on it. If you do, return the other exiled cards to the battlefield under their owner's control attached to that permanent.