The Demon Seed is a legendary Warlock spell card that belongs to the "United in Stormwind" set, which was released on 03.08.2021 and is one of initially 135 cards. The artist of this card was Slawomir Maniak, who also made 84 other artworks for Hearthstone.
The flavor text of the card is the following: Just need some elbow grease to get this working. Oh, and your soul.
The card is easy to memorize with 97.06% of correct quiz questions.