Giant Oyster

Summon - Oyster    (CMC:4)

You may choose not to untap Giant Oyster during your untap phase. : Target tapped creature does not untap during its controller's untap phase as long as Giant Oyster remains tapped. During your upkeep, put a -1/-1 counter on that creature. If Giant Oyster becomes untapped or leaves play, remove all these counters from the creature.

HM • ENNicola Leonard

™ & © 1993—1995 Wizards of the Coast

Legal in: Modern,Time Spiral Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

Giant Oyster {2}{U}{U} Creature — Oyster 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. 0/3

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View this MTG card on Gatherer

10/4/2004
If the Oyster untaps during the draw step before its ability to add a -1/-1 counter resolves, the -1/-1 counter effect resolves and adds a -1/-1 counter after the -1/-1 counters are removed due to being untapped.
9/25/2006
The activated ability can target only a tapped creature.
9/25/2006
Activating the ability creates a continuous effect that works only as long as Giant Oyster remains tapped, a repeating delayed triggered ability that's in effect only as long as Giant Oyster remains tapped, and a delayed triggered ability that triggers when Giant Oyster untaps or when it leaves the battlefield.
9/25/2006
Giant Oyster's ability can be activated during your upkeep, and the creature will get a -1/-1 counter during the draw step that follows it.

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Card Giant Oyster is not on TCGPlayer.