Cheapest priced copy (Urza's Saga): $0.79 at Card Kingdom, near mint, their price list as of .
Sulfuric Vapors 
Enchantment · Rare · Urza's Saga · #220
If a red spell would deal damage to a permanent or player, it deals that much damage plus 1 to that permanent or player instead.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Urza's Saga | 220 | Rare | $0.79 | — |
2 rulings from Wizards of the Coast
- 4 October 2004The ability is a replacement effect which is applied when damage would become dealt.
- 4 October 2004If the red spell damages more than one target, add 1 to each target.