Cheapest priced copy (Scars of Mirrodin): $0.35 at Card Kingdom, near mint, their price list as of .
Vigil for the Lost 
Enchantment · Uncommon · Scars of Mirrodin · #26
Whenever a creature you control dies, you may pay {X}. If you do, you gain X life.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Scars of Mirrodin | 26 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 January 2011As the ability resolves, you choose a value for X and decide whether to pay {X}. If you do decide to pay {X}, it’s too late for any player to respond since the ability is already in the midst of resolving.