Umbra Mystic is a rare Creature — Human Wizard card from Rise of the Eldrazi (ROE), collector number 52. Current market price: $6.64 (foil $23.42), TCGplayer market prices via Scryfall.
Auras attached to permanents you control have umbra armor. (If an enchanted permanent you control would be destroyed, instead remove all damage from it and destroy an Aura attached to it.)