Cheapest priced copy (Foundations): $0.35 at Card Kingdom, near mint, their price list as of .
Courageous Goblin 
Creature — Goblin · 2/2 · Common · Foundations · #82
Whenever this creature attacks while you control a creature with power 4 or greater, this creature gets +1/+0 and gains menace until end of turn. (It can't be blocked except by two or more creatures.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations | 82 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 8 November 2024If you controlled a creature with power 4 or greater when you declared Courageous Goblin as an attacker, it doesn't matter whether you still control one as its ability resolves. Courageous Goblin will still get +1/+0 and gain menace until end of turn.