Cheapest priced copy (Duel Decks: Zendikar vs. Eldrazi): $0.35 at Card Kingdom, near mint, their price list as of .
Tajuru Archer 
Creature — Elf Archer Ally · 1/2 · Uncommon · Zendikar · #185
Whenever this creature or another Ally you control enters, you may have this creature deal damage to target creature with flying equal to the number of Allies you control.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Duel Decks: Zendikar vs. Eldrazi | 23 | Uncommon | $0.35 | — |
| Zendikar | 185 | Uncommon | $0.35 | $0.99 |
2 rulings from Wizards of the Coast
- 1 October 2009You target a creature when the ability triggers. You decide whether to have Tajuru Archer deal damage to that creature as the ability resolves.
- 1 October 2009The ability counts the number of Allies you control as it resolves.