Spirit Jailer is a common Warlock/Demon Hunter minion card that belongs to the "Scholomance Academy" set, which was released on 06.08.2020 and is one of initially 135 cards. The artist of this card was Ben Olson, who also made 10 other artworks for Hearthstone.
The flavor text of the card is the following: "Sure, they're in your deck, but the mind is like, the REAL prison."
The card is easy to memorize with 95.92% of correct quiz questions.