Kezan Mystic is a rare neutral minion card that belongs to the "Goblins vs. Gnomes" set, which was released on 08.12.2014 and is one of initially 123 cards. The artist of this card was Jakub Kasper, who also made 108 other artworks for Hearthstone.
The card costs 4 mana, has 4 attack and 3 health, and its card text reads: "Battlecry: Take control of a random enemy Secret."
The flavor text of the card is the following: They pretend to be wise and enlightened, but they mostly just hate to be left out of a secret.
Based on 100 quiz answers, the card is moderately hard to memorize: 88% of them were correct.