Buried Treasure is a common Artifact — Treasure card from The Lost Caverns of Ixalan (LCI), collector number 246. Current market price: $0.24 (foil $0.29), TCGplayer market prices via Scryfall.
{T}, Sacrifice this artifact: Add one mana of any color. {5}, Exile this card from your graveyard: Discover 5. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 5 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.)