I think the downside is that it might not have a lot of playability outside of Commander
Its also an infinite turn outlet in mono Red
The primary upside of being in white for this kind of deck is having access to some of white's sideboard cards (Fragmentize) but also having access to things like Lavinia, Azorius Renegade
(They create a Clue token.) II, IV Create a 2/2 black Alien Angel artifact creature token with first strike, vigilance, and "Whenever an opponent casts a creature spell, this permanent isn't a creature until end of turn." People often assume that Sagas are a strict progression from top to bottom, but actually, from a non-linear, non-subjective viewpoint, it's more like a big ball of wibbly wobbly, timey-wimey
Choosing the Tear part is not an option
Having a good understanding of the phases of a turn will allow us to move into other concepts, such as attacking and card types that have restrictions on when they can be cast