Luckily, theres no need to rely on the fuzzy memory of your 10-year-old self with the release of Pokmon TCG Battle Academy, its easier than ever to learn or re-learn the (correct) rules to the game

Home Magic Singles Supplementary Product & Special Editions Masterpiece Series: Amonkhet & Hour of Devastation Invocations Masterpiece Series: Amonkhet & Hour of Devastation Invocations Sealed Products Marvel Super Heroes - Play Booster Box Booster Boxes $145.00 View Product The Hobbit - Scene Box Set Available for Preorder $110.00 Pre-Order The Lord of the Rings: Tales of Middle-Earth - Commander Deck Set Commander Product $285.00 View Product Avatar: The Last Airbender - Play Booster Pack Booster Packs $6.00 View Product Throne of Eldraine Brawl Deck - Faerie Schemes Commander Product $80.00 View Product Modern Horizons 3 - Commander Deck (Creative Energy) Commander Product $40.00 View Product The Lord of the Rings: Tales of Middle-Earth - Commander Deck (Riders of Rohan) Commander Product $70.00 View Product Ikoria: Lair of Behemoths Commander 2020 - Symbiotic Swarm Commander Product $70.00 View Product Avatar: The Last Airbender - Jumpstart Booster Pack Booster Packs $5.00 View Product Avatar: The Last Airbender - Jumpstart Booster Box Booster Boxes $95.00 View Product Filter: In Stock Out of Stock Show All View as: More Filters Checkout Add All to Cart Loyal Retainers - Foil NM-Mint, English 2 In Stock NM-Mint, English 2 In Stock NM-Mint, English 2 In Stock Checkout Add All to Cart

An important update is that Xyz Material isn't used the same way it was before, now you simply say material instead
However, its extremely doubtful that the shooting itself was the reason why the card was modified, as a change like that would have been planned and executed further in advance than how close Dragons Exalted was released after the tragedy
In early 2019, sealed boxes in good condition were trading between approximately $50,000 and $80,000 at auction (Heritage Auctions set a record of $78,000 in February 2019)
A raw copy of a Pikachu (XY-P Promotional Cards) card costs 34,690 JPY (~US$245)