I've played this game a number of times, and to be honest... If you want an adult version of a deck builder, you could just mod slay the spire or some others known among the community. 

     While I would normally enjoy the concept of transformation-based content, the AI art is disappointing for the most part. At least if it was real art, attack animations or something more could be added to the game to be more lively, but instead it's a stretch and return action. Story is okay, but nothing I'd bat an eye to.

     Only reason I didn't give it a 1 is because of my first sentence. "I've played this game a number of times," so there must have been something there that had me play it every time. Could be the rng, the concept, or something more, but I don't think I'll find myself playing it again unless it got some form of overhaul to give the game some proper life.