Treasures, card draw and a win-condition all tacked onto things your deck already wants to do like cycle, rummage, or wheel
Black Mage's Rod is extremely good, as it provides a pinger creature potentially even after the creature it makes dies
The power curve in the Sword and Shield era was getting so intense that if The Pokmon Company introduced a card more powerful than the mighty VSTAR, it would probably need to have 500HP and award four prize cards in order to be balanced
The Radiant cards, with their unique holographic treatment and alternate-color artwork, provide an accessible entry point for collectors who love the shiny Pokemon aesthetic without the premium price tags of the Galarian Gallery
Id love to be wrong about Viven as she seems like a fine choice for the current grindy metagame (if companions dont run over the format)
Playing to the theme of Paradox Pokemon, Professor Sadas Vitality lets you keep your Ancient Pokemon powered up by bringing back Basic Energies from your discard pile and attaching them to your Pokemon