Assimilation Aegis is a mythic Artifact — Equipment card from Outlaws of Thunder Junction (OTJ), collector number 348. Current market price: $1.49 (foil $2.03), TCGplayer market prices via Scryfall.
When this Equipment enters, exile up to one target creature until this Equipment leaves the battlefield. Whenever this Equipment becomes attached to a creature, for as long as this Equipment remains attached to it, that creature becomes a copy of a creature card exiled with this Equipment. Equip {2}