嗜睡症 (CS Narcolepsy)

结界～ - 灵气    (CMC:2)

结附于生物 在每个维持开始时，若所结附的生物为未横置，则横置它。

「它睡着的样子真可爱，不是吗？其实它还是一样的可恶，但至少它目前没在想着要杀掉我们。」 ～塔晋息法师诺言达

052 MM2 • CSJohann Bodin

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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.