Cheapest priced copy (Ikoria: Lair of Behemoths): $0.35 at Card Kingdom, near mint, their price list as of .
Sleeper Dart 
Artifact · Common · Ikoria: Lair of Behemoths · #240
When this artifact enters, draw a card.
{T}, Sacrifice this artifact: Target creature doesn't untap during its controller's next untap step.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ikoria: Lair of Behemoths | 240 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 17 April 2020Sleeper Dart’s second ability doesn’t tap the creature. It can target any creature, tapped or untapped. If that creature is already untapped at the beginning of its controller’s next untap step, the effect won’t do anything.