Cheapest priced copy (Mirrodin): $1.79 at Card Kingdom, near mint, their price list as of .
Glissa Sunseeker 
Legendary Creature — Elf Warrior · 3/2 · Rare · Mirrodin · #120
First strike
{T}: Destroy target artifact if its mana value is equal to the amount of unspent mana you have.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $1.79 to $5.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Mirrodin | 120 | Rare | $1.79 | $5.99 |
| Secret Lair Drop | 491 | Rare | $2.49 | $3.99 |
2 rulings from Wizards of the Coast
- 1 December 2004You need to have the unspent mana before the ability resolves. The ability doesn't allow you to activate mana abilities while it's resolving.
- 1 December 2004The artifact's mana value must be exactly equal to the amount of unspent mana you have when the ability resolves. If there's less mana or more mana, the artifact won't be destroyed.