Icefall Regent is a rare Creature — Dragon card from Dragons of Tarkir (DTK), collector number 58. Current market price: $0.42 (foil $3.10), TCGplayer market prices via Scryfall.
Flying When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control this creature. Spells your opponents cast that target this creature cost {2} more to cast.