There is loads of cool art for Hearthstone cards. Seeing them up close gives you a better appreciation for the design work that goes into the cards.
Here is a Hearthstone Mage Wallpaper Art that you can use as your desktop background. Jaina Proudmoore doesn’t look so friendly in high-def as she does in-game. Great image though.
Just click on the image for the full-size image.
