Claim Jumper is a rare Creature — Rabbit Mercenary card from Outlaws of Thunder Junction (OTJ), collector number 310. Current market price: $2.55 (foil $4.30), TCGplayer market prices via Scryfall.
Vigilance When this creature enters, if an opponent controls more lands than you, you may search your library for a Plains card and put it onto the battlefield tapped. Then if an opponent controls more lands than you, repeat this process once. If you search your library this way, shuffle.