Death Toll Mine

{t}: {r}
If you control no mountains, sacrifice Death Toll
Mine. If you control more than three mountains,
Death Toll Mine has:
{3}, {t}: target creature can't be blocked this turn.
{4}, {t}: exile target creature. Return that card to
the battlefield under its owner's control at the beginning of the next end step.
{t}, sacrifice a mountain: Each opponent sacrifices
a creature or planeswalker at random.