[Resolved 2/15] The team is looking into reports that Kazakusan is not working as intended. Early reports seem to show that the card is working as intended in Standard, but is having issues in Duels (and maybe in Arena). There appear to have been two related issues with Kazakusan in Duels. We are in the process of deploying a hotfix that should resolve both those issues.
[Resolved 2/15] The team is aware that Rogue and Demon Hunter Mini-Set achievements are not showing with Patch 22.4. The issue has been identified and the achievements are expected to be added into the game in the next major patch (Patch 22.6).