Cheapest priced copy (Core Set 2020): $0.35 at Card Kingdom, near mint, their price list as of .
Goblin Bird-Grabber 
Creature — Goblin · 2/1 · Common · Core Set 2020 · #142
{R}: This creature gains flying until end of turn. Activate only if you control a creature with flying.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Core Set 2020 | 142 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 12 July 2019The only time that Goblin Bird-Grabber's ability checks whether you control a creature with flying is the moment you activate that ability. It's not checked again as the ability resolves or any time later in the turn.