Having fun and exciting moments in Hearthstone is important to us, so today we’re announcing an upcoming change to the way you’ll experience cracking open Hearthstone card packs.
WAAAH, Legendary!
Starting with the release of Hearthstone’s next expansion (but applying to ALL Hearthstone card packs),
every time you open a Legendary in a card pack, it will be a Legendary card from the same set that you don’t already own. Once you own either the golden or non-golden version of a Legendary card, you won’t get a duplicate of it until you own all the Legendary cards from that set. Soon, you’ll be able to craft a Legendary without the worry of opening it in your next few packs!
In addition,
you will never open more copies of any card in a pack than you can use in a single deck—no more opening three or more of the same common, rare, or epic card in one pack!
Even More Legendary!
Beginning with the release of the next expansion, you’re also
guaranteed to get a Legendary within your first 10 packs of a new set. The release of a new Hearthstone expansion is a super exciting time, and with this change we hope your pack openings start off on a celebratory note!
Combined, these changes should make the pack opening experience more exciting than ever—especially when you see that flash of gold heralding a Legendary card!
http://us.battle.net/hearthstone/en/blog/20852959/