Some 'Hearthstone' cards will be phased out with April's expansion
 

Blizzard has solidified Hearthstone's annual flow of retiring old cards and welcoming new ones: For the third year in a row, a new expansion will come in April that signals a sea change in the digital card game. While we don't know the title or flavo...

https://www.engadget.com/2018/02/27/...-of-the-raven/