Tocasia, Dig Site Mentor is a rare Legendary Creature — Human Artificer card from The Brothers' War Promos (PBRO), collector number 224p. Current market price: $0.22 (foil $0.66), TCGplayer market prices via Scryfall.
Creatures you control have vigilance and "{T}: Surveil 1." (To surveil 1, look at the top card of your library. You may put that card into your graveyard.) {2}{G}{G}{W}{W}{U}{U}, Exile this card from your graveyard: Return any number of target artifact cards with total mana value 10 or less from your graveyard to the battlefield. Activate only as a sorcery.