Cheapest priced copy (Conflux): $0.35 at Card Kingdom, near mint, their price list as of .
Aven Squire 
Creature — Bird Soldier · 1/1 · Common · Conflux · #3
Flying
Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
3 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Conflux | 3 | Common | $0.35 | $0.99 |
| Magic 2013 | 6 | Common | $0.35 | $0.79 |
| The List | CON-3 | Common | $0.35 | — |