Cheapest priced copy (Double Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Strength of Arms 
Instant · Common · Shadows over Innistrad · #40
Target creature gets +2/+2 until end of turn. If you control an Equipment, create a 1/1 white Human Soldier creature token.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
4 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters | 33 | Common | $0.35 | $0.49 |
| Game Night: Free-for-All | 18 | Common | $0.35 | — |
| Innistrad Remastered | 42 | Common | $0.35 | $0.49 |
| Shadows over Innistrad | 40 | Common | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 7 August 2020The Human Soldier token that you'll create can't be the target to get +2/+2.
- 7 August 2020You'll create only one token, no matter how many Equipment you control beyond the first.
- 7 August 2020You'll create a Human Soldier token if you control any Equipment, not just one attached to the target creature, or even to any creature at all.