If not for experimentation and deck building I would have left the game years ago, because there aren't that many of us out there, especially in better ranks, it's hard to have fun alone sometimes. I almost hate it when they release new mechanics that greatly improve old decks, because I always have reasons to try something else in Wild. Possibilities never end no matter the class. Dredge for example, and sir finley to an extent, vastly improved decks that heavily rely on draw order to simply function, like dragon rogue. And every new card makes you want to slightly alter your deck to better fit said new cards so you end up play testing with even more cards.
I hardly ever play more than 3 games in a row without altering my deck or playing another one. Still climbing.