Quiet Contemplation

Enchantment    (CMC:3)

Whenever you cast a noncreature spell, you may pay . If you do, tap target creature an opponent controls and it doesn't untap during its controller's next untap step.

050 KTK • ENMagali Villeneuve

™ & © 1993—2014 Wizards of the Coast

Legal in: Modern,Khans of Tarkir Block,Legacy,Vintage,Commander

Oracle Text (click to copy):

Quiet Contemplation {2}{U} Enchantment Whenever you cast a noncreature spell, you may pay {1}. If you do, tap target creature an opponent controls and it doesn't untap during its controller's next untap step.

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9/20/2014
You decide whether to pay  as the triggered ability resolves.
9/20/2014
The ability can target a creature that’s already tapped. It still won’t untap during its controller’s next untap step.
9/20/2014
The ability tracks the creature, but not its controller. If the creature changes controllers before its first controller’s next untap step has come around, then it won’t untap during its new controller’s next untap step.

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Card Quiet Contemplation is not on TCGPlayer.