Callaphe, Beloved of the Sea is a uncommon Legendary Enchantment Creature — Demigod card from Theros Beyond Death (THB), collector number 260. Current market price: $0.23 (foil $0.28), TCGplayer market prices via Scryfall.
Callaphe's power is equal to your devotion to blue. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.) Creatures and enchantments you control have "Spells your opponents cast that target this permanent cost {1} more to cast."