Majordomo Executus is a legendary neutral minion card that belongs to the "Blackrock Mountain" set, which was released on 02.04.2015 and is one of initially 31 cards. The artist of this card was Alex Horley Orlandelli, who also made 147 other artworks for Hearthstone.
The flavor text of the card is the following: You thought Executus turned you into Ragnaros, but really Ragnaros was in you the whole time.
The card is easy to memorize with 96.55% of correct quiz questions.