Cheapest priced copy (Throne of Eldraine): $0.35 at Card Kingdom, near mint, their price list as of .
Barge In 
Instant · Common · Throne of Eldraine · #112
Target attacking creature gets +2/+2 until end of turn. Each attacking non-Human creature gains trample until end of turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Throne of Eldraine | 112 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 4 October 2019If the target attacking creature is an illegal target by the time Barge In tries to resolve, the spell won't resolve. Your attacking non-Human creatures won't gain trample.