Koth of the Hammer (Duel Decks: Venser vs. Koth)

Legendary Planeswalker — Koth - +1: Untap target Mountain. It becomes a 4/4 red Elemental creature until end of turn. It's still a land.
?2: Add {R} for each Mountain you control.
?5: You get an emblem with "Mountains you control have '{T}: This land deals 1 damage to any target.'"