Charmander has always been the most popular of the original three Gen 1 starters, leading to the value of that particular card to have surged in comparison to those of the other three
So you want some number of difficult-to-answer cards that naturally line up well against their removal, which can help close out games once the initial aggression is handled by them
This is pretty straightforward stuff, with the sort of distribution were used to: guaranteed foils of the new sweet lands, guaranteed foils of commons and uncommons in the new frames, a guaranteed foil rare or mythic, an extended-art version of the Commander rares (nonfoil only, a choice I still dont understand) and then the last slot, where the rarest, shiniest things live
Plus, its a legendary Weasel
Omnath, Locus of Creation is a powerful new Landfall commander: generating insane mana is as easy as playing + cracking a fetchland, and one more landfall trigger is some serious damage that will make any Superfriends deck cry