Cheapest priced copy (Urza's Destiny): $0.59 at Card Kingdom, near mint, their price list as of .
Archery Training 
Enchantment — Aura · Uncommon · Urza's Destiny · #2
Enchant creature
At the beginning of your upkeep, you may put an arrow counter on this Aura.
Enchanted creature has "{T}: This creature deals X damage to target attacking or blocking creature, where X is the number of arrow counters on Archery Training."
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $0.59 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Urza's Destiny | 2 | Uncommon | $0.59 | $3.99 |
3 rulings from Wizards of the Coast
- 4 October 2004Putting on a counter is optional. If you forget, you can't go back later even if it is something you usually do.
- 4 October 2004You do not remove counters when using the ability.
- 4 October 2004If there is more than one Archery Training on a creature, each granted ability counts the counters on the Archery Training that granted that ability.