Cheapest priced copy (Eventide): $3.99 at Card Kingdom, near mint, their price list as of .
Light from Within 
Enchantment · Rare · Eventide · #10
Chroma — Each creature you control gets +1/+1 for each white mana symbol in its mana cost.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $3.99 to $24.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eventide | 10 | Rare | $3.99 | $24.99 |
3 rulings from Wizards of the Coast
- 1 August 2008Chroma abilities check only mana costs, which are found in a card’s upper right corner. They don’t count mana symbols that appear in a card’s text box.
- 1 August 2008Light from Within affects each creature individually. For example, if you control a creature with mana cost {1}{W}{W} and a creature with mana cost {W/B}{W/B}{W/B}{W/B}{W/B}, the first creature gets +2/+2 and the second creature gets +5/+5.
- 1 August 2008Chroma abilities count hybrid mana symbols of the appropriate color. For example, a card with mana cost {3}{U/R}{U/R} has two red mana symbols in its mana cost.