Cheapest priced copy (Modern Horizons): $0.35 at Card Kingdom, near mint, their price list as of .
Goblin Champion 
Creature — Goblin Warrior · 0/1 · Common · Modern Horizons · #127
Haste
Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons | 127 | Common | $0.35 | $0.79 |
One ruling from Wizards of the Coast
- 14 June 2019A creature attacks alone if it’s the only creature declared as an attacker during the declare attackers step (including creatures controlled by your teammates, if applicable). For example, exalted won’t trigger if you attack with multiple creatures and all but one of them are removed from combat.