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):
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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.