Devour Mind is a rare Priest spell card that belongs to the "Knights of the Frozen Throne" set, which was released on 10.08.2017 and is one of initially 135 cards. The artist of this card was Paul Kwon, who also made 2 other artworks for Hearthstone.
The card costs 5 mana and its card text reads: "Copy 3 cards in your opponent's deck and add them to your hand."
The flavor text of the card is the following: A mind is a terrible thing to waste. Seconds, anyone?
Based on 151 quiz answers, the card is moderately hard to memorize: 85.43% of them were correct.