Skull of Gul'dan is a rare Demon Hunter spell card that belongs to the "Ashes of Outland" set, which was released on 07.04.2020 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: A fellow of evil possessed, of most devious shadow. He hath turned on his kin a thousand times, and now, how abhorred in all imagination he is!
The card is easy to memorize with 97.1% of correct quiz questions.