The Triumphant set from HeartGold & SoulSilver featured two-part legend cards featuring legendary pairings like Palkia with Dialga and Entei with Suicune, among others
Lorcana The First Chapter Booster Pack 18 In this pack, we got: Commons: Cerberus Three-Headed Dog, Tinker Bell Most Helpful, Archimedes Highly Educated Owl, Dinglehopper, Philoctetes Trainer of Heroes, and Peter Pan Never Landing Uncommons: Triton The Sea King, Flynn Rider Charming Rogue, and Reflection Rare or above: Mickey Mouse Artful Rogue (Super Rare), and Iago Loud-Mouthed Parrot (Rare) Foil: Jasper Common Crook (Uncommon) A decent enough pack with the Super Rare and Uncommon Foil
For modern cards, rarity still matters, but treatment matters too
Attack 2: [W] Giant Geyser GX Attach any number of W Energy cards from your hand to your Pokmon in any way you like
Although Dialga V beats Palkia V in terms of price, the Secret Rare version of Origin Forme Palkia VSTAR is also the fourth most valuable card sitting at $50
One of the most prominent cards in the meta at the time, in Standard in 2018 and 2019, was Mewtwo & Mew TAG TEAM
