Thank you for the feedback!
I should have put indicator that reinforcing with same suits was the way to go, that's my bad. The "x" not changing was some sort of bug I currently am trying to fix. Last one is a bit sad: I wanted to add opponent board & cards but the card system was written from scratch and It was already barely a "clean" working game and I did not want to risk breaking it but I really should have added that definetally.