Geological Appraiser is a uncommon Creature — Human Artificer card from The Lost Caverns of Ixalan (LCI), collector number 150. Current market price: $0.20 (foil $0.28), TCGplayer market prices via Scryfall.
When this creature enters, if you cast it, discover 3. (Exile cards from the top of your library until you exile a nonland card with mana value 3 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)