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They have some lovely synergies: Mewtwo has a super-powerful attack that requires you to dispose of two energy from it every time it's used, but Gardevoir, a third-stage evolution that takes just long enough to find and lay down to be somewhat balanced, has an ability that can be used from the bench, allowing you to attach one more Psychic energy to a Pokmon of your choice

In fact, there are only two Iconic cards available in all of Lorcana (at least for the moment)

Popular characters like Luffy, Zoro, and Law also increase desirability

For example, if you're only pulling from Genetic Apex - Mewtwo, then it's a good idea to buy cards that only appear in Charizard or Pikachu packs