Terror of the Peaks is a mythic Creature — Dragon card from Secret Lair Drop (SLD), collector number 2650. Current market price: $27.81 (foil $27.13), TCGplayer market prices via Scryfall.
Flying Spells your opponents cast that target this creature cost an additional 3 life to cast. Whenever another creature you control enters, this creature deals damage equal to that creature's power to any target.