The other Snow Legendary is Narfi, Betrayer King
springjaw trap Jamie: TJ: Melvin: Saltwater taffy is my preferred springjaw trap
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
I think the downside is that it might not have a lot of playability outside of Commander