When Oreskos Explorer enters the battlefield, search your library for up to X Plains cards, where X is the number of players who control more lands than you. Reveal those cards, put them into your hand, then shuffle your library.
Near Mint - $0
Lightly Played - $0
Moderately Played - $0
Heavily Played - $0
Damaged - $0
Near Mint Spanish - $0
Lightly Played Spanish - $0
Moderately Played Spanish - $0
Heavily Played Spanish - $0
Damaged Spanish - $0