There are deck-building machines back in the Professors lab that unlock opponents decks, but you need the cards in your inventory for the machines to make said decks
Recommended Options Dark Lord's Cape - For the same reason it was recommended in Blue
You start with 300 slots, and can expand inventory slots from quests, events, battle pass rewards, or even by paying Gil
Not only was the Charizard card a holo version also known as a shiny Charizard, which is considered to be one of the most popular cards on the collectors market it was also shadowless, meaning that a printing error had occurred in the making of the card, leading to there being no shadow behind the image of the Pokmon, making even rarer
4 Dark Leo & Shredder Legendary Creature Moving on to this Orzhov legendary creature, Dark Leo & Shredder is a two mana 1/3 legendary with sneak that gives all attacking ninjas you control deathtouch