Lumbering Falls is a rare Land card from Edge of Eternities: Stellar Sights (EOS), collector number 69. Current market price: $1.50 (foil $2.60), TCGplayer market prices via Scryfall.
This land enters tapped. {T}: Add {G} or {U}. {2}{G}{U}: Until end of turn, this land becomes a 3/3 green and blue Elemental creature with hexproof. It's still a land.