Mad Scientist is a common neutral minion card that belongs to the "Curse of Naxxramas" set, which was released on 22.07.2014 and is one of initially 30 cards. The artist of this card was James Ryman, who also made 281 other artworks for Hearthstone.
The flavor text of the card is the following: His mother wanted him to be a mage or a warlock, but noooooooo, he had to go and be a scientist like his father.
The card is easy to memorize with 95.79% of correct quiz questions.