it changes how players will play too, I frequently float mana and hold cards back just to not fill up my board and give myself options, especially with some token generating cards like brood awaken, this change means I don't have to be as careful
Great point. And if the rule is working well, hopefully we'll be making more decisions like brood awakening based on what you think your opponent is trying to do (not based just on the state of your back row)