Koth, Fire of Resistance

[+2]: Search your library for a basic Mountain card, reveal it, put it into your hand, then shuffle.
[−3]: Koth, Fire of Resistance 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."

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+2: Search your library for a basic Mountain card, reveal it, put it into your hand, then shuffle.
−3: Koth, Fire of Resistance deals damage to target creature equal to the number of Mountains you control.
−7: You get an emblem with "Whenever a Mountain enters the battlefield under your control, this emblem deals 4 damage to any target."

Koth's emblem is colorless. Notably, this means that protection from red won't stop a permanent or player from being the target of the emblem's ability, nor will it prevent the damage being dealt. Replacement effects that care about damage from a red source don't apply to it.