Mantle of the Ancients is a rare Enchantment — Aura card from Fallout (PIP), collector number 980. Current market price: — (foil $20.16), TCGplayer market prices via Scryfall.
Enchant creature you control When this Aura enters, return any number of target Aura and/or Equipment cards from your graveyard to the battlefield attached to enchanted creature. Enchanted creature gets +1/+1 for each Aura and Equipment attached to it.