Onyxia of the Void puzzle 8/8 can not be beaten due to the health change to Runaway Blackwing (9–>10 health)
The solution is different now, it is still possible to complete it.
https://www.reddit.com/r/hearthstone/comments/1jep98f/onyxia_of_the_void_puzzle_88_doesnt_work_anymore/