Fieldmist Borderpost is a common Artifact card from Alara Reborn (ARB), collector number 5. Current market price: $0.24 (foil $3.92), TCGplayer market prices via Scryfall.
You may pay {1} and return a basic land you control to its owner's hand rather than pay this spell's mana cost. This artifact enters tapped. {T}: Add {W} or {U}.