Coffin Of The Iron Mountain

When Coffin Of The Iron Mountain enter the battlefield, if another Domain is on the battlefield,
they clash.
At the beginning of each turn, Coffin Of The Iron Mountain deals 1 damage to each creature and planeswalkers your opponents control.
{2}{p/r} : Coffin Of The Iron Mountain deals 6
damage to any target, if a creature would die this
way, Exile it instead.