Galakrond's Awakening Adventure Guide & Card List
You'll see more neutrals and less class cards since the last patch.
This means classes will have harder time making come backs and classes that relied heavily on class cards (example Priest) to be relevant will be worse.
#1 Arena Leader Board Player in North America - August 2018
#2 NA Nov 18, #2 Asia July 19
In my opinion dropping from 3x to 1x is a huge failure and a lazy nerf. If instead class cards were discovered even 1.5x more often it would be more enjoyable and fixes the "draw self" cards as well
The 3x class card offering was applied to the Arena draft during the dual event and should not have stayed in effect when it ended.
Blizzard is just fixing its mistake.