Cheapest priced copy (Kamigawa: Neon Dynasty): $0.35 at Card Kingdom, near mint, their price list as of .
Ninja's Kunai 
Artifact — Equipment · Common · Kamigawa: Neon Dynasty · #252
Equipped creature has "{1}, {T}, Sacrifice Ninja's Kunai: Ninja's Kunai deals 3 damage to any target."
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Kamigawa: Neon Dynasty | 252 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 18 February 2022If a player gains control of a creature equipped with an opponent's Ninja's Kunai without also gaining control of the Equipment, they cannot activate the ability it grants the equipped creature because you cannot sacrifice permanents you don't control.