Suggestion for Homecoming: make boons/hazards affect both sides again.
One thing that I always liked about Gwent, and it amounted to most of the strategy in Witcher 3 (besides being very flavorful), was the fact that most lane effects affected both sides of the board. I think that it allows for a lot of strategy, especially when rows matter. You can try to be aggressive and play your units on different rows than the opponent, or you can try to play safe and play on the opposite rows.
If they want to make rows matter, and not only have people playing cards on random rows, I think this would be a cool addition. Cards like Kambi could work only on its row and the opposite row; maybe full moon could cast itself on your row and blood moon on the opposite row, etc.
I'm not saying that all weather should be symmetric, but having symmetric effect is a good way of introducing a further mind-game and making movement units more interesting and important.