Ashen Rain

Ashen Rain enters the battlefield tapped.
When Ashen Rain enters the battlefield, it deals 1 damage to each creature for each red mana spent
to cast it. Then sacrifice Ashen Rain unless at
least one black mana was spent to cast it.
All creatures get -1/-1 while Ashen Rain is
untapped.
The eruption from blanketed most of the south in ash, bringing about a quick end to the war.