Cheapest priced copy (Commander 2013): $0.49 at Card Kingdom, near mint, their price list as of .
Foster 
Enchantment · Rare · Mercadian Masques · #247
Whenever a creature you control dies, you may pay {1}. If you do, reveal cards from the top of your library until you reveal a creature card. Put that card into your hand and the rest into your graveyard.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.49 to $16.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2013 | 146 | Rare | $0.49 | — |
| Mercadian Masques | 247 | Rare | $0.59 | $16.99 |