Anarii was an extreme outlier in how difficult she was, and we felt she needed more changes than just her deck's contents. Increasing the cost of her hero power through a hotfix will cause her Hero Power to be red until the next client update, because the server and client's information do not match.
Giovanni Scarpati
We pushed some server side changes today to help balance out Heroic mode.
Patch notes here: https://us.forums.blizzard.com/en/hearthstone/t/hotfixes-for-the-dalaran-heist-may-24-2019/5959/5
Anarii was an extreme outlier in how difficult she was, and we felt she needed more changes than just her deck's contents. Increasing the cost of her hero power through a hotfix will cause her Hero Power to be red until the next client update, because the server and client's information do not match.