For modern cards, rarity still matters, but treatment matters too
One of the most prominent cards in the meta at the time, in Standard in 2018 and 2019, was Mewtwo & Mew TAG TEAM
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
According to Menery's official statement, the MtG card was so powerful it should've been banned because players did not have to "sacrifice a spot in the 100 to use play it," meaning that any Magic: The Gathering player could use the card so long as they were playing the right colors at the time
Attack 2: [W] Giant Geyser GX Attach any number of W Energy cards from your hand to your Pokmon in any way you like
Usually, sideboards need to reserve some space for Artifact, and Enchantment removal effects, but Boseiju allows such effects to be run in the main deck
