Soul of the Murloc is a common Shaman spell card that belongs to the "Rise of Shadows" set, which was released on 09.04.2019 and is one of initially 136 cards. The artist of this card was Jason Kang, who also made 57 other artworks for Hearthstone.
The flavor text of the card is the following: Previously thought nonexistent.
The card is easy to memorize with 95% of correct quiz questions.
