Sowing Salt is a uncommon Sorcery card from Betrayers of Kamigawa (BOK), collector number 118. Current market price: $0.11 (foil $0.49), TCGplayer market prices via Scryfall.
Exile target nonbasic land. Search its controller's graveyard, hand, and library for all cards with the same name as that land and exile them. Then that player shuffles.