Koth, Mirrodin Redeemer

+1: You may put a basic Mountain from your hand onto the battlefield tapped. If you do, deal 2 damage to target player or creature.
-X: Mountains you control become X/4 red Elemental creatures until end of turn with haste. They are still lands.
-7: Opponents get an emblem with "Whenever a player casts a red spell, you lose 2 life."