Treva's Ruins is a uncommon Land — Lair card from Dominaria Remastered (DMR), collector number 260. Current market price: $0.31 (foil $0.38), 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}.