Aspect of Mongoose is a uncommon Enchantment — Aura card from Time Spiral (TSP), collector number 191. Current market price: $2.29 (foil $7.41), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature has shroud. (It can't be the target of spells or abilities.) When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.