HearthStone players can earn a brand new card back for participating in the November Ranked Play Season Play that has kicked off as of today. This month's card back is called "Halfhill" and can be earned by achieving Rank 20 in Standard or Wild Ranked Play.
Players can earn Ranked Play reward chests according to the highest earned rank during a season. These can contain the seasonal card backs, Arcane Dust, golden cards and more. Reward chest are earned by playing Standard or Wild Ranked Play games.
Check out the HearthStone site for more information.