Cheapest priced copy (The Lord of the Rings: Tales of Middle-earth): $2.79 at Card Kingdom, near mint, their price list as of .
Fires of Mount Doom 
Legendary Enchantment · Rare · The Lord of the Rings: Tales of Middle-earth · #392
When Fires of Mount Doom enters, it deals 2 damage to target creature an opponent controls. Destroy all Equipment attached to that creature.
{2}{R}: Exile the top card of your library. You may play that card this turn. When you play a card this way, Fires of Mount Doom deals 2 damage to each player.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $2.79 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| The Lord of the Rings: Tales of Middle-earth | 294 | Rare | $2.79 | — |
| The Lord of the Rings: Tales of Middle-earth | 392 | Rare | $2.99 | — |
4 rulings from Wizards of the Coast
- 16 June 2023You pay all costs and follow all normal timing rules for a card played this way. For example, if the exiled card is a land card, you may play it only during your main phase while the stack is empty.
- 16 June 2023Fires of Mount Doom's first ability can target a creature that has no Equipment attached to it.
- 16 June 2023If you activate Fires of Mount Doom's last ability but don't play the exiled card this turn using that casting permission, Fires of Mount Doom won't deal damage to each player.
- 16 June 2023If the target of Fires of Mount Doom's first ability is illegal by the time the ability tries to resolve, it's removed from the stack. You won't destroy any Equipment.