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PSA: You cannot access Standard/Wild unless you have at least one wild card in your collection
As a new player, I found this out the hard way after talking with Blizzard support for an hour - your game client will appear exactly as the old client, no Kraken, Standard/Wild option, etc - unless you have at least 1 wild card in your collection.
EDIT: You can craft a Wild card and then just click "Undo" to trigger the changeover to the new UI
Daxxarri
Hello! I'm sorry that you had a challenges figuring out how to access Wild, but it is covered in the FAQ section of the New Way to Play blog. There was a lot of information to cover, so I'm sorry if it got a little lost in there.