Very nice. I feel like either 5x5 board or on-board fusion or disappearing black card after playing it would be even better, because the round is so short right now
Thanks for the suggestions. 5x5 would be difficult to realize without shrinking the cards. On-board fusion is an interesting idea, I'll think about it. If black cards disappeared, that would mean that matches could take forever, as it is rather easy to create black cards and they currently connect in all four directions.