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Callaphe's power is equal to your devotion todevotion toEach in the mana costs of permanents you control counts toward your devotion to blue. 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 more to cast."
Hover an underlined rule to see what it means.
Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.
