Dogmeat, Ever Loyal is a mythic Legendary Creature — Dog card from Fallout (PIP), collector number 530. Current market price: — (foil $23.89), TCGplayer market prices via Scryfall.
When Dogmeat enters, mill five cards, then return an Aura or Equipment card from your graveyard to your hand. Whenever a creature you control that's enchanted or equipped attacks, create a Junk token. (It's an artifact with "{T}, Sacrifice this token: Exile the top card of your library. You may play that card this turn. Activate only as a sorcery.")