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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.
Cards that are face down in exile have no characteristics. Such cards can't be put onto the battlefield with Oblivion Sower's ability.
Oblivion Sower's ability allows you to put any land cards the player owns from exile onto the battlefield, regardless of how those cards were exiled.
