Cheapest priced copy (Dominaria): $0.35 at Card Kingdom, near mint, their price list as of .
Sparring Construct 
Artifact Creature — Construct · 1/1 · Common · Dominaria · #232
When this creature dies, put a +1/+1 counter on target creature you control.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria | 232 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 27 April 2018If another creature is dealt lethal damage at the same time as Sparring Construct, Sparring Construct’s ability can’t put a +1/+1 counter on the other creature in time to save it.