Your search for "Lumbering Falls 299" revealed the following:
Lumbering Falls (C21) from Commander 2021, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Titus Lunter Card Text:Lumbering Falls enters the battlefield tapped.T: Add G or U.2GU: Lumbering Falls becomes a 3/3 green and blue Elemental creature with...
Mountain (299) - Full Art (NEO) from Kamigawa: Neon Dynasty, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Ayami Nakashima Card Text:T: Add R.