Farms have ruined a part of the game, hunting for rares.
When it was 1.14, I remember myself grinding AI1 to find a second lobotomizer, which was fun.
Now, to get rares, you just have to click top50 and have luck. I know it's unfair, but think at it this way.
Rares are meant to be rare. As now, they're just not buyable, instead of rares.
A fighting farm could still be a good idea. Remember that Top 50 used to be the decks that the 50 best players used, not their collection of rares.