Quiet Contemplation is a uncommon Enchantment card from Khans of Tarkir (KTK), collector number 50. Current market price: $0.20 (foil $0.66), TCGplayer market prices via Scryfall.
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.