Essentially, treat them with respect and all will go great
Quuador May 13, 2017, 11:39am 8 Color inconsistencies happened a lot in the earlier sets (Base, Jungle, Fossil, Base 2), and in XY Evolutions as well I might add If you just look at some of the Base Pikachus I have (old picture, got around 10 more unique ones now), you see a lot of color differences on first glance regarding yellow vs darker yellow (ignore the sun-bleached and albino bordered ones ): And even more if you zoom in (here is a link so you can zoom in: ))
Indeed, there are already 100s of birds in Magic to-date (roughly 400 in fact), with more coming out every year
This would of course avoid alot of confusion among players (in major international events) and would benefit everybody since this is much easier to explain to players on what you should look out for when cards rotate out
Prices are influenced by scarcity, collector demand, and competitive relevance
As you probably already know, Unfinity (UNF) marks the first time that an Un set has had entirely new cards that are legal in Eternal formats