Cheapest priced copy (Lorwyn): $0.35 at Card Kingdom, near mint, their price list as of .
Protective Bubble 
Enchantment — Aura · Common · Lorwyn · #80
Enchant creature
Enchanted creature can't be blocked and has shroud. (It can't be the target of spells or abilities.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Lorwyn | 80 | Common | $0.35 | $4.49 |