Medivh's Valet is a common Mage minion card that belongs to the "One Night in Karazhan" set, which was released on 11.08.2016 and is one of initially 45 cards. The artist of this card was Sean McNally, who also made 22 other artworks for Hearthstone.
The flavor text of the card is the following: "Magus Medivh sir, I've brought the flaming balloons, as you requested."
The card is easy to memorize with 95% of correct quiz questions.
