Frontier Seeker is a uncommon Creature — Human Scout card from Outlaws of Thunder Junction (OTJ), collector number 368. Current market price: $0.18 (foil $0.30), TCGplayer market prices via Scryfall.
When this creature enters, look at the top five cards of your library. You may reveal a Mount creature card or a Plains card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.