Herald Volazj is a legendary Priest minion card that belongs to the "Whispers of the Old Gods" set, which was released on 26.04.2016 and is one of initially 134 cards. The artist of this card was Luke Mancini, who also made 23 other artworks for Hearthstone.
The flavor text of the card is the following: His whole job is yelling "Yogg-Saron comin'!"
The card is easy to memorize with 90.53% of correct quiz questions.