Buried Treasure (LCI-246) - The Lost Caverns of Ixalan

, Sacrifice this artifact: Add one mana of any color.
, 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.)