Decks like Storm and Ad Nauseam would get a slight boost in power, but those decks are far enough down in the metagame that a boost of power might be a good thing
I wanna say that in Casual Commander itll be less relevant than Swan Song, despite being able to counter Commanders
However, during the 1996-2011 era, multi-color options were much more limited
With an abundance of mana in your pool an easy feat when playing green Bristly Bill can double your counters over and over, turning even the weakest Creatures into oversized game-ending threats
I'm not sure if people will default to Vehicles or some crazy control/combo stuff, but either way I love seeing unique mono-white Commanders
It may not hit the lofty heights of Evolving Skies and Celebrations, but it has some awesome chase cards in it, some great Pokemon and an interesting mechanic