Hearthstone’s December 2015 Ranked Play Season, the Slammin’ Shaman, is coming to a close at the end of the month, and your chances of acquiring the Shaman Thrall card back for your collection will soon come to an end!
This elementally furious card back will only be available during December, so be sure to hit Rank 20 before the 1st of January and the card back will be awarded to you at the end of the season.
The January 2016 season—and a new card back along with it—await you next month!