Cheapest priced copy (Avacyn Restored): $0.35 at Card Kingdom, near mint, their price list as of .
Homicidal Seclusion 
Enchantment · Uncommon · Avacyn Restored · #108
As long as you control exactly one creature, that creature gets +3/+1 and has lifelink.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avacyn Restored | 108 | Uncommon | $0.35 | $0.49 |