Cheapest priced copy (Lorwyn Eclipsed Commander): $0.99 at Card Kingdom, near mint, their price list as of .
Beholder's Disintegration Ray 
Fire Covenant
Instant · Rare · Secret Lair Drop · #1796
As an additional cost to cast this spell, pay X life.
Fire Covenant deals X damage divided as you choose among any number of target creatures.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
4 printings · $0.99 to $16.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Lorwyn Eclipsed Commander | 54 | Uncommon | $0.99 | — |
| Ice Age | 289 | Uncommon | $1.99 | — |
| Secret Lair Drop | 271 | Rare | $15.99 | $16.99 |
| Secret Lair Drop (Beholder's Disintegration Ray) | 1796 | Rare | $6.49 | $6.99 |
3 rulings from Wizards of the Coast
- 16 September 2007If X is 0, the number of targets must also be 0.
- 16 September 2007You must distribute at least 1 damage to each target.
- 16 September 2007You divide the damage as you cast the spell. You can't redistribute the damage if any of the target creatures becomes illegal before the spell resolves.