It’s bad. It’s not good. It isn’t random; it tries to enforce fairness leading to patterns leading to lack of fairness. Please introduce true randomness to the shuffler. Because again, the one you have isn’t good. Happy to provide more thorough details about my experience if you have questions.

As it stands, arena isn’t a game of me versus another person it’s a game of me versus how do I get not too many lands or not to few lands. The shuffler’s land priority grab is not helping. Go back to random.