Koth, Fire of Resistance is a rare Legendary Planeswalker — Koth card from Phyrexia: All Will Be One Promos (PONE), collector number 138p. Current market price: $0.74 (foil $1.30), TCGplayer market prices via Scryfall.
+2: Search your library for a basic Mountain card, reveal it, put it into your hand, then shuffle. −3: Koth deals damage to target creature equal to the number of Mountains you control. −7: You get an emblem with "Whenever a Mountain you control enters, this emblem deals 4 damage to any target."