Cheapest priced copy (Odyssey): $1.79 at Card Kingdom, near mint, their price list as of .
Charmed Pendant 
Artifact · Rare · Odyssey · #298
{T}, Mill a card: For each colored mana symbol in the milled card's mana cost, add one mana of that color. (Activate only as an instant. For example, if the card's mana cost is {3}{U}{U}{B}, you add {U}{U}{B}.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $1.79 to $12.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Odyssey | 298 | Rare | $1.79 | $12.99 |
2 rulings from Wizards of the Coast
- 4 October 2004The ability is still a mana ability (and doesn’t use the stack) even though you can only activate it when you could cast an instant.
- 1 November 2005If you flip over a hybrid card, you get one of either color mana, not both, for each mana symbol.