Maximum value, newest set, strong availability
The designers at Wizards put effort into creating token characters with widespread appeal, Jumblebones in particular, then offered players no means of opening said tokens in physical packs
The Galarian Gallery cards featured extended-art illustrations that placed Pokemon in richly detailed, atmospheric environments rather than the standard isolated battle-pose compositions, and the Mewtwo VSTAR was one of the most impressive entries in the entire subset
Values can spike when new games drop, anniversaries generate nostalgia, or influencers spotlight particular cards
It's based on their rarity, condition, and popularity
There are card sleeves that allow you to change the back of your cards to an image you like, play mats to change the image of the in-play zone, Pokmon coins, and more