Cheapest priced copy (Innistrad: Double Feature): $0.49 at Card Kingdom, near mint, their price list as of .
Stensia Uprising 
Enchantment · Rare · Innistrad: Crimson Vow · #381
At the beginning of your end step, create a 1/1 red Human creature token. Then if you control exactly thirteen permanents, you may sacrifice this enchantment. When you do, it deals 7 damage to any target.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 445 | Rare | $0.49 | $0.99 |
| Innistrad: Crimson Vow Promos | 178s | Rare | — | $0.59 |
| Innistrad: Crimson Vow | 178 | Rare | $0.49 | $0.49 |
| Innistrad: Crimson Vow | 381 | Rare | $0.49 | $0.49 |