Crumble to Dust
3R
Sorcery
Devoid (This card has no colour.)
Exile target nonbasic land. Search its controller's graveyard, hand, and library for any number of cards with the same name as that land and exile them. Then that player shuffles his or library.
A fair bit better than Sowing Salt. Relevant in Standard due to its interaction with Oblivion Sower.