In Hearthstone: Heroes of Warcraft for the PC, there are special card backs you can unlock for your decks.
These are essentially just for show, and don’t grant any kind of bonuses, but are a nice way to show off your dedication to the game.
Unlocking Monthly Card Backs
Every month there is a new special card back. To unlock these monthly card backs, you need to reach Rank 20 in Ranked Play for that given month.
Unlocking Special Card Backs
There are a couple other special card backs as well that you can unlock that aren’t part of the monthly card backs.
Fireside Friends Card Back – Play three matches against other players on your network. You must have at least three other players signed in to unlock this. The best way to get this is to have three of your friends play several games at someone’s house, and all of you will unlock it after your third game.
Legends Card Back – This one will probably be the most coveted. To unlock this, you need to reach the Legend rank in any given month.