Callaphe, Beloved of the Sea (Showcase) (THB-260) - Theros Beyond Death: (enchantment, Showcase)

Callaphe's power is equal to your devotion to blue. (Each 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."