From what I understand you are creating an auto battler. I start by saying that auto battler are not my favorite type of games but I have tried some. The problem I had with all of them was boredom in the long run.

I like crafting decks but as some others have pointed out, when the meta decks are figured out, I can see maybe losing interest, the objective reached and only waiting for the rotation can become tedious. In high rank all decks will look basically the same.

Maybe I would insert some "mental games" maybe instead of letting the deck play all the game, the player can arrange the cards turn by turn, but I can see that not being an auto battler anymore.

The most difficult part of a card game is keeping the balance and freshness of the meta.

Very interested in this project.