Cheapest priced copy (The List): $6.49 at Card Kingdom, near mint, their price list as of .
Spellstutter Sprite 
Creature — Faerie Wizard · 1/1 · Common · Lorwyn · #89
Flash
Flying
When this creature enters, counter target spell with mana value X or less, where X is the number of Faeries you control.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
6 printings · $6.49 to $37.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Friday Night Magic 2011 | 2 | Rare | — | $27.99 |
| Jumpstart 2022 | 65 | Common | $9.99 | — |
| Lorwyn | 89 | Common | $7.49 | $37.99 |
| Modern Masters | 65 | Common | $6.99 | $13.99 |
| The List | LRW-89 | Common | $6.49 | — |
| Secret Lair Drop | 117 | Rare | — | $29.99 |
One ruling from Wizards of the Coast
- 1 October 2007The value of X needs to be determined both when the ability triggers (so you can choose a target) and again when the ability resolves (to check if that target is still legal). If the number of Faeries you control has decreased enough in that time to make the target illegal, Spellstutter Sprite’s ability won’t resolve (and the targeted spell will resolve as normal).