Cheapest priced copy (Wilds of Eldraine): $0.35 at Card Kingdom, near mint, their price list as of .
Faerie Fencing 
Instant · Uncommon · Wilds of Eldraine · #90
Target creature gets -X/-X until end of turn. That creature gets an additional -3/-3 until end of turn if you controlled a Faerie as you cast this spell.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Wilds of Eldraine | 90 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 September 2023If you controlled a Faerie as you finished casting Faerie Fencing, it doesn't matter whether you still control one as the spell resolves. The target creature will still get an additional -3/-3.