Cheapest priced copy (Double Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Weapons Trainer 
Creature — Human Soldier Ally · 3/2 · Uncommon · Oath of the Gatewatch · #160
Other creatures you control get +1/+0 as long as you control an Equipment.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters | 228 | Uncommon | $0.35 | $0.49 |
| Oath of the Gatewatch | 160 | Uncommon | $0.35 | $0.49 |
| The List | OGW-160 | Uncommon | $0.35 | — |
2 rulings from Wizards of the Coast
- 7 August 2020Weapons Trainer's ability applies even if the Equipment you control isn't attached to any creature.
- 7 August 2020Weapons Trainer's ability gives just +1/+0, no matter how many Equipment you control beyond the first.