Cheapest priced copy (Avatar: The Last Airbender): $0.35 at Card Kingdom, near mint, their price list as of .
Yip Yip! 
Instant — Lesson · Common · Avatar: The Last Airbender · #43
Target creature you control gets +2/+2 until end of turn. If that creature is an Ally, it also gains flying until end of turn.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avatar: The Last Airbender | 43 | Common | $0.35 | $0.49 |