Koth of the Hammer

Koth’s first ability can target any Mountain, including an untapped Mountain and/or a Mountain another player controls.

Koth’s emblem grants an activated ability to each Mountain you control at any given time for the rest of the game. It will continuously check which permanents you control are Mountains to determine what has the ability. For example, a Mountain that comes under your control later in the game will have the ability, while a Mountain you controlled at the time the emblem was created, but that later came under the control of another player, will no longer have the ability.

Loyalty abilities can’t be mana abilities. Koth’s second ability uses the stack and can be countered or otherwise responded to. Like all loyalty abilities, it can be activated only once per turn, during your main phase, when the stack is empty, and only if no other loyalty abilities of this permanent have been activated this turn.