Koth, the Geomancer is a uncommon Legendary Creature — Human Warrior card from Reality Fracture (FRA), collector number 248. Current market price: $0.22 (foil $0.37), TCGplayer market prices via Scryfall.
Reach Landfall — Whenever a land you control enters, Koth deals 1 damage to each opponent. If that land is a Mountain, add {R}.