The split between English and Japanese releases comes down to print quality, distribution, and market demand: English Releases: Feature natural yellow borders, standard booster pack pulls (often 1 in 2 boxes), highly variable factory cuts, and a massive grading population due to global collector demand
Once stabilized, the deck usually outscales aggro opponents
I remember with the Baldur's Gate set, many of the important characters in the lore got shafted and were placed at uncommon to make way to promote Baldur's Gate 3
At the same time, trainers Pokemon also tend to get unique boosts from other card effects that only work for that specific line of Pokemon
Form of the Approach of the Second Sun Form of the Approach of the Second Sun feels a bit more like an Un-set card than the other silver-bordered honorable mentions, and it might not even be worth the headache even if your playgroup allows it
I would have preferred a lower casting cost and no damage bonus