Cheapest priced copy (Visions): $1.79 at Card Kingdom, near mint, their price list as of .
Lightning Cloud 
Enchantment · Rare · Visions · #87
Whenever a player casts a red spell, you may pay {R}. If you do, this enchantment deals 1 damage to any target.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $1.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Visions | 87 | Rare | $1.79 | — |
2 rulings from Wizards of the Coast
- 4 October 2004Triggers when the spell is cast.
- 4 October 2004You pick the target when putting the triggered ability on the stack, but you don’t choose whether or not to pay {R} until the triggered ability resolves.