Dugtrio, Digging Trio

{t}, Exile a creature card from your graveyard: Discover X, where X is the mana value of the exiled card. Activate only as a sorcery. (Exile
cards from the top of your library until you
exile a nonland card with that mana value 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.)