The puzzle 6/7 is no longer solvable due to the fact that smite now deals 3 damage instead of 2.
I imagine there may be a few other bugs related to puzzles because of the most recent card changes.
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Hey Blizz,
I also just tried to solve the puzzle and have the same issue. Hope it will be fixed soon.
Best 
It is expected to be fixed in a week:
Still don’t think the puzzle has been fixed.
Latest update is some time today. But since they had also said the 9th, 10th and 13th, I would say soon™ is more accurate.