Treva's Ruins is a uncommon Land — Lair card from Planeshift (PLS), collector number 143. Current market price: $2.57 (foil $65.88), TCGplayer market prices via Scryfall.
When this land enters, sacrifice it unless you return a non-Lair land you control to its owner's hand. {T}: Add {G}, {W}, or {U}.