File:Nithogg HS.jpg

Summary
Artwork used by the HS Nithogg card in Hearthstone: Descent of Dragons. Artwork by Peet Cooper: ArtStation page

Source

 * https://blizzard.gamespress.com/December-5-Hearthstone-Update
 * https://www.metabomb.net/hearthstone/news/card-reveal-nithogg-descent-of-dragons