Cheapest priced copy (Core Set 2020): $0.35 at Card Kingdom, near mint, their price list as of .
Sleep Paralysis 
Enchantment — Aura · Common · Shadows over Innistrad · #87
Enchant creature
When this Aura enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Core Set 2020 | 75 | Common | $0.35 | $0.49 |
| Shadows over Innistrad | 87 | Common | $0.35 | $0.49 |
| Welcome Deck 2017 | 11 | Common | $0.35 | — |
One ruling from Wizards of the Coast
- 12 July 2019If the target creature is an illegal target by the time Sleep Paralysis tries to resolve, the spell doesn't resolve. It won't enter the battlefield, so its ability won't trigger.