In a similar sense, I think that if we are working with self milling cards or just a high ratio of spell cards in general, then Psychic Spiral can itself be a powerful win condition to reach a similar goal as the previous examples
While the best Sun and Moon cards like Lillie or Umbreon GX are prized for art, others are expensive staples in the Expanded format
Along with having only a 20 card limit, a deck can only have up to 3 energy types
Battle Partners Set Officially Revealed Featuring Owners Pokemon
Conjure, Seek, and giving cards perpetual buffs or debuffs are the main draw
Brilliant Stars is likely to be more available for the average collector, so hopefully this is your time to get your hands on an ultra rare Marnie card