Ugin Planeswalkers of the past have often been splashy, powerful, and valuable
Pippa, Duchess of Dice Dice have always been the part of un-sets that I think is the closest to just being part of normal Magic
They even threw in vigilance, which means your pumped up Wight of the Reliquary can attack with impunity and still activate its ability on an opponents turn
Things like a basic-evolving Ho-Oh BREAK are easier to build around, but a competitive Greninja BREAK deck may need four copies of Froakie, four Frogadier, four Greninja, and four Greninja BREAK to be as consistent as possible
Yes, we learned how to do collation better over time, and that impacted how we made sets, but we didn't truly take advantage of what collation could do as a design feature
However, as a rule, many fans of Pokmon cards do not play the game itself - they only collect cards