Sleep

Sorcery    (CMC:4)

Tap all creatures target player controls. Those creatures don't untap during that player's next untap step.

"I give them dreams so wondrous that they hesitate to return to the world of the conscious."

71 M10 • ENChris Rahn

™ & © 1993—2009 Wizards of the Coast

Legal in: Pioneer,Modern,Legacy,Vintage,Commander

Oracle Text (click to copy):

Sleep {2}{U}{U} Sorcery Tap all creatures target player controls. Those creatures don't untap during that player's next untap step.

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10/1/2009
The second part of Sleep's effect affects all creatures the targeted player controls as Sleep resolves, not just the ones that Sleep actually caused to become tapped.
10/1/2009
Sleep tracks both the player and the creatures. If one of the creatures controlled by the targeted player as Sleep resolves changes controllers, the creature will untap as normal during its new controller's next untap step.

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Card Sleep is not on TCGPlayer.