June has arrived! Hopefully you didn't miss last month's card back Shadowmoon Valley. Regardless, a new one is up for grabs this month and all you have to do is reach Rank 20 in Wild or Standard. It's a nice, cool, earthen card back that's ready to grace the back of your collection: Zul'Drak.
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Hearthstone® June 2016 Ranked Play Season – Back in Zul’drak

The June Ranked Play Season is now live—and we’re unveiling a new card back you can add to your collection!

What’s cooler than being cool? The frigid Zul’drak card back, of course! You can earn this icy card back by playing Hearthstone during the month of June.

These card backs replace the art decorating the reverse side of your cards and are a great way to show off your Hearthstone accomplishments. Add the Zul’drak card back to your collection by hitting Rank 20 in either Standard or Wild Ranked Play modes. You’ll receive the Zul’drak card back at the end of June’s Ranked Play Season in your Ranked Play reward chest.

You earn Ranked Play reward chests based on your highest earned rank over the course of a Ranked Play season. Reward chests may contain seasonal card backs, Arcane Dust, and golden cards, and can be obtained by playing in either Standard or Wild Ranked Play modes. You’ll be awarded one chest per Ranked Play season based on your highest rank between the two modes.

Don’t forget—the further you move up the Ranked Play ladder, the more bonus stars you’ll receive next season. In Ranked Play, you’ll receive bonus stars based on your performance from the previous season—one bonus star per rank you attained. Please note that even if bonus stars from the previous season get you directly to Rank 20 or above, you still have to log in at least once each Ranked Season to qualify for the card back reward.

Don’t be droll! Be an Ice troll in June’s Ranked Play season, Back in Zul’drak!