Various Pokemon Center exclusive promos: Japan's Pokemon Centers regularly release promotional cards tied to events, holidays, and regional openings
Use space to separate less closely-related elements, such as keeping cards in a hand close together or fanned out, having player decks be on their side, and spacing out different playable zones
The missing holographic foil layer coupled with the blue core results in more light being transmitted through this card
5 Prismari, The Inspiration Borderless Foil - $33.97 It's a hat-trick of Elder Dragons on the list, with Prismari, the Inspiration, coming in at fifth
Acornelia, Fashionable Filcher highlights one of the genius elements of un-sets: the ability to leverage aspects of the cards like art to become parts of gameplay