Cheapest priced copy (Kamigawa: Neon Dynasty): $0.35 at Card Kingdom, near mint, their price list as of .
Lethal Exploit 
Instant · Common · Kamigawa: Neon Dynasty · #107
Target creature gets -2/-2 until end of turn. It gets an additional -1/-1 until end of turn for each modified creature you controlled as you cast this spell. (Equipment, Auras you control, and counters are modifications.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Kamigawa: Neon Dynasty | 107 | Common | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 18 February 2022A creature that is equipped is considered modified no matter who controls the Equipment that's attached to it.
- 18 February 2022An Aura controlled by an opponent does not cause a creature you control to be modified.
- 18 February 2022A creature with a counter on it is considered modified no matter what kind of counter it is or which player put it on that creature.