Cheapest priced copy (Khans of Tarkir): $0.35 at Card Kingdom, near mint, their price list as of .
Armament Corps 
Creature — Human Soldier · 4/4 · Uncommon · Khans of Tarkir · #165
When this creature enters, distribute two +1/+1 counters among one or two target creatures you control.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Khans of Tarkir | 165 | Uncommon | $0.35 | $0.49 |
| The List | KTK-165 | Uncommon | $0.35 | — |
2 rulings from Wizards of the Coast
- 20 September 2014The enters-the-battlefield ability can target Armament Corps itself.
- 20 September 2014You choose how the counters will be distributed as you put the ability on the stack. Notably, if you choose to put one +1/+1 counter on each of two target creatures, and one of those creatures becomes an illegal target in response, the +1/+1 counter that would’ve gone on that creature is lost. It can’t be put on the remaining legal target.