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ConstellationConstellationAbility word: triggers whenever an enchantment enters under your control. — Whenever this creature or another enchantment you control enters, doubledoubleAll spells and abilities cast, activated, or triggered by you are copied. Mana abilities produce twice as much mana. target creature's power and toughness until end of turn.
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.