등급전 2015년 11월 시즌 - 블리즈컨에서 공개됩니다

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!

출처: http://us.battle.net/hearthstone/en/blog/19931214