Cheapest priced copy (Eventide): $0.35 at Card Kingdom, near mint, their price list as of .
Groundling Pouncer 
Creature — Faerie · 2/1 · Uncommon · Eventide · #154
{G/U}: This creature gets +1/+3 and gains flying until end of turn. Activate only once each turn and only if an opponent controls a creature with flying.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eventide | 154 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 1 August 2008It matters that an opponent controls a creature with flying only as you activate this ability. Once you've activated it, Groundling Pouncer will still get +1/+3 and gain flying, even if all of your opponents' creatures with flying leave the battlefield in response to the ability or after the ability resolves.