Sleeping Potion is a common Enchantment — Aura card from The List (PLST), collector number PLS-34. Current market price: $0.06, TCGplayer market prices via Scryfall.
Enchant creature When this Aura enters, tap enchanted creature. Enchanted creature doesn't untap during its controller's untap step. When enchanted creature becomes the target of a spell or ability, sacrifice this Aura.