sacrifice digsite conservator: exile up to four target cards from a single graveyard. activate only as a sorcery. when digsite conservator dies, you may pay 4. if you do, discover 4. (exile cards from the top of your library until you exile a nonland card with mana value 4 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.)