Icy Blast is a rare Instant card from Khans of Tarkir (KTK), collector number 42. Current market price: $1.05 (foil $2.04), TCGplayer market prices via Scryfall.
Tap X target creatures. Ferocious — If you control a creature with power 4 or greater, those creatures don't untap during their controllers' next untap steps.