Cheapest priced copy (Double Masters 2022): $0.35 at Card Kingdom, near mint, their price list as of .
Ambuscade 
Instant · Common · Hour of Devastation · #110
Target creature you control gets +1/+0 until end of turn. It deals damage equal to its power to target creature an opponent controls.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters 2022 | 133 | Common | $0.35 | $0.49 |
| Hour of Devastation | 110 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 14 July 2017If the creature you control leaves the battlefield before Ambuscade resolves, Ambuscade has no effect and no damage is dealt. If the creature an opponent controls leaves the battlefield instead, the creature you control gets +1/+0 even though it won't deal any damage.