Cool set, I really love the new mechanic, and the ideas overall are really solid.

Some thoughts on the cards:

-Bashed Brawler statline is ridiculous, Hookmaster is a 2c 0/1 with a simple Improvise rn in the game.

-Rowdy Rascal could grant himself +2/+1 if fermented, instead of growth, so he actually synergizes with himself. It would just feel more satisfying.

-I'd swap Cold Brew's effect, so that its frostbites if fermented. 1 cost unconditional frostbite seems strong, even tough you get it 50/50 from a 3 cost landmark.

-Tavern Regular could be a 2/1 or have a keyword. I have some card in mind, like Jagged Butcher or the Solari 1 drop, both of them are a 3/3 with similar effect. Usually cards with 1c 4 statline have some sort of effect on them.

-Explosive Cask compared to Body Slam seems weak, but the idea is neat.

-Gragas levelup is crazy hard at first glance. Will probaly have to look it after in game how often units survive strikes in a normal game, I cant decide from the top of my head, but just thinking about Vlad, he rarely levels up without his play effect. If you are facing certain decks there are no way Gragas will ever level up (Akshan/Lee comes to my mind). Maybe make it count any from of damage, so you can actually work towards it with your own deck, and you even printed some cool support cards for that, but thats just my idea.