Cheapest priced copy (War of the Spark): $0.35 at Card Kingdom, near mint, their price list as of .
Domri's Ambush 
Sorcery · Uncommon · War of the Spark · #192
Put a +1/+1 counter on target creature you control. Then that creature deals damage equal to its power to target creature or planeswalker you don't control.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| War of the Spark | 192 | Uncommon | $0.35 | $0.79 |
3 rulings from Wizards of the Coast
- 3 May 2019You can’t cast Domri’s Ambush unless you choose both a creature you control and a creature or planeswalker you don’t control as targets.
- 3 May 2019If either target is an illegal target as Domri’s Ambush tries to resolve, the creature you control won’t deal damage.
- 3 May 2019If the creature you control is an illegal target as Domri’s Ambush tries to resolve, you won’t put a +1/+1 counter on it. If that creature is a legal target but the other target isn’t, you’ll still put the counter on the creature you control.