Rage, the Relentless

+3: Until the end of turn, each Mountain you control gains "Tap: Deal 1 damage to target creature or player."
-X: Draw X cards then mill X+3 cards. Rage, the Relentless deals X damage to target opponent and each creature that player controls.
-10: Destroy each land target opponent controls. Rage deals damage equal to the number of lands destroyed this way to another target opponent.