
EnchantEnchantThis Aura can only be attached to the stated kind of object or player. modifiedmodifiedEquipment, Auras its controller controls, and counters are modifications. creature (Equipment, Auras its controller controls, and counters are modifications.)
Enchanted creature gets +3/+3 and has reach and vigilance.
Umbra armorUmbra armorIf enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura. (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)
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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.