Narcolepsie (FR Narcolepsy)

Enchantement : aura    (CMC:2)

Enchanter : créature Au début de chaque entretien, si la créature enchantée est dégagée, engagez-la.

« C'est tellement mignon quand ça dort, hein ? En fait non, c'est aussi abject endormi qu'éveillé, mais au moins ça n'essaie pas de nous tuer. » —Noyan Dar, ataraxmage de Tazeem

79 ROE • FRJohann 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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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.