睡眠発作 (JP Narcolepsy)

エンチャント ― オーラ    (CMC:2)

エンチャント（クリーチャー） 各アップキープの開始時に、エンチャントされているクリーチャーがアンタップ状態である場合、それをタップする。

「寝ているときは可愛いと思わないか？ まあ、それでも忌まわしきものには違いないんだが、少なくとも我々を殺そうとはしていない。」 ――タジームの凪魔道士、ノヤン・ダール

79 ROE • JPJohann Bodin

™ & © 1993—2010 Wizards of the Coast

Notes: TODO: Update Copyright

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

Oracle Text (click to copy):

Narcolepsy {1}{U} Enchantment — Aura Enchant creature At the beginning of each upkeep, if enchanted creature is untapped, tap it.

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View this MTG card on Gatherer

6/15/2010
Narcolepsy's triggered ability has an "intervening 'if' clause." That means (1) the ability triggers only if the enchanted creature is untapped as any player's upkeep begins, and (2) the ability does nothing if the enchanted creature is already tapped by the time it resolves.
6/15/2010
Narcolepsy doesn't keep the enchanted creature continually tapped. The creature untaps during its controller's untap step as normal, then is tapped when Narcolepsy's ability resolves during that upkeep. The creature may be tapped in response (for example, if it has an activated ability with  in its cost).

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Card Narcolepsy is not on TCGPlayer.