How da hell i unlock wild cards??..sly…fu blizzard.
You can craft wild cards using dust.
In order to play wild, you need to have a deck that is marked as wild. (Even if it contains only cards that are valid in standard).
In order to mark a deck as wild, you need to have at least one wild card, AND be at rank 25 or better.
In order to get a wild card, you need to either buy (using real money) a wild pack from the store and open it, or you can craft a wild card (using dust). There is no way to get wild cards with gold.
In order to craft a wild card, you need to be at rank 25 or better. Go to your collection directly from the main menu (not while already editing a deck). Click on the deck selector. Select All Cards or a specific wild expansion. Go to crafting, find a card you like, and craft it.
Hope this helps.
Get to Rank 25, unlock the Frozen Throne adventure FOR FREE by claiming it from the Battle.net store. This will unlock Wild.