Chilling Grasp is a uncommon Instant card from Eldritch Moon (EMN), collector number 50. Current market price: $0.11 (foil $0.35), TCGplayer market prices via Scryfall.
Tap up to two target creatures. Those creatures don't untap during their controller's next untap step. Madness {3}{U} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)