Koth, Furious Rage

+1: Untap up to 2 target mountains. If mana generated by those lands this turn is spent on a creature spell, it gains haste until end of turn.
-2: Koth, Furious Rage deals damage to target creature or player equal to the amount of mana in your mana pool.
-6: You get an Emblem with: "Whenever mana leaves your mana pool, this emblem deals 1 damage to target player".