Oblivion Sower is a mythic Creature — Eldrazi card from Modern Horizons 3 Commander (M3C), collector number 158. Current market price: $0.69, TCGplayer market prices via Scryfall.
When you cast this spell, target opponent exiles the top four cards of their library, then you may put any number of land cards that player owns from exile onto the battlefield under your control.