Peak Eruption | Magic: The Gathering
Formats Peak Eruption is Legal in
Official Oracle Text for Peak Eruption
—Hira, street oracle
Official Rulings for Peak Eruption
9/15/2013 : If the target Mountain is an illegal target when Peak Eruption tries to resolve, it will be countered and none of its effects will happen. No damage will be dealt. However, if Peak Eruption resolves and the Mountain isn’t destroyed (perhaps because it has indestructible), damage will be dealt.