Herald Naga achievement

How do you progress? I have activated a couple of a Herald battlecry, but there is no progress ...

Seems like the Warlock Herald is bugged.

Try using Priest one. I didn't have time checking Druid and Demon Hunter. But Priest one is worked.

Druid herald also works and fits perfectly in a token Druid deck which even has a decent enough winrate.

Quote From h0lysatan

Seems like the Warlock Herald is bugged.

Try using Priest one. I didn't have time checking Druid and Demon Hunter. But Priest one is worked.

in fact ... that was my herald :(

I can confirm Herald of Shadows is bugged and won't progress Harold Who?.

Here's the deck I used to complete the achievement.