Peak Eruption
Sorcery
Destroy target Mountain. Peak Eruption deals 3 damage to that land's controller.
"Early olive buds? A good omen. Flock of crows? Not so good. Mountain exploding? Bad. Very, very bad." —Hira, street oracle
Adam Paquette
Theros (THS)
• #132Rulings
Peak Eruption can target any land with the subtype Mountain, not just those named Mountain. It can't target a land that doesn't have that subtype, even if the land can tap for {R}.
(wotc • 2013-09-15)
If the target Mountain is an illegal target when Peak Eruption tries to resolve, it won't resolve 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.
(wotc • 2013-09-15)
Rulings
Peak Eruption can target any land with the subtype Mountain, not just those named Mountain. It can't target a land that doesn't have that subtype, even if the land can tap for {R}.
(wotc • 2013-09-15)
If the target Mountain is an illegal target when Peak Eruption tries to resolve, it won't resolve 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.
(wotc • 2013-09-15)