palkia pokemon card gx - 20/131 - Ultra Rare GX rule Pokemon SM Forbidden Light Card:

// Flying While resolving Valefor's first chapter ability, the next opponent in turn order chooses a creature with the greatest mana value among creatures they control, then each other opponent in turn order does the same

We all gawped at his size and tried in vain to make him work before learning about crucial concepts like cheaper cards are better and your spells need to actually do something. That didnt stop Vizzerdrix from showing up in three straight core sets, though

This layering of rarity full arts, secret rares, and eventually full art secret rares created the collectibility hierarchy that drives the modern TCG

Popular characters, collecting trends, and limited availability can all drive prices upwards