Cheapest priced copy (Theros): $0.35 at Card Kingdom, near mint, their price list as of .
Peak Eruption 
Sorcery · Uncommon · Theros · #132
Destroy target Mountain. Peak Eruption deals 3 damage to that land's controller.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Theros | 132 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 15 September 2013Peak 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}.
- 15 September 2013If 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.