Cheapest priced copy (Tenth Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Heart of Light 
Enchantment — Aura · Common · Tenth Edition · #19
Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Prevent all damage that would be dealt to and dealt by enchanted creature.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
3 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tenth Edition | 19 | Common | $0.35 | — |
| Tenth Edition | 19★ | Common | — | $0.99 |
| Betrayers of Kamigawa | 6 | Common | $0.35 | $0.49 |