Millicent is by far the strongest spirit tribal commander
There are several things you could do to improve the quality of MTG cards, this includes using high-resolutions images, high quality cardstock and advanced printers
Even though weve slowly gotten some interesting coin flip (and coin flip support) cards over the years, its still a rather small pool of cards, which makes it a pretty unidirectional kind of build
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Notes and Rules Information for All Will Be One: All Will Be One's ability will trigger any time you put one or more counters on a permanent or player
Vrondiss was definitely the strongest of the initial wave of die rolling commanders, but it has the least support for building around die rolling (and a bunch of other compelling themes)
A great investment, if you ask us