《巨大カキ》

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Summon - Oyster

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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]:U [TSB]:S