Blizzard has announced the card back for the November 2015 Season will be announced at Blizzcon! This monthly seasonal card back will still be rewarded by reaching at least Rank 20 in Ranked Play. What do you think it could be?
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Hearthstone® November 2015 Ranked Play Season

What is this month’s card back?  It’s a secret, and it will be revealed at BlizzCon!

The usual rules apply, so you’ll want to reach rank 20 before the end of the month in order to add this unrevealed card back to your collection.

Keep an eye out for the official release of this month’s card back, coming soon!