Cheapest priced copy (Crimson Vow Commander): $1.29 at Card Kingdom, near mint, their price list as of .
Haunted Library 
Enchantment · Rare · Crimson Vow Commander · #44
Whenever a creature an opponent controls dies, you may pay {1}. If you do, create a 1/1 white Spirit creature token with flying.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $1.29 to $1.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Crimson Vow Commander | 6 | Rare | $1.29 | — |
| Crimson Vow Commander | 44 | Rare | $1.79 | — |