In your deck, you should have three different types of cards: Pokemon - The most important cards are the actual Pokemon cards, of which there're multiple per individual pocket monster, since each Pokemon usually has several evolutions
7 Sol Ring - Elven - Commander: The Lord of the Rings: Tales of Middle-earth Mythic Rare - $674.87 Sol Ring might not strike you as a particularly valuable card, but over the years Magic has taken to printing multiple special variants of the card for different occasions
(I havent actually played with this, so its possible Im overrating it, but probably not by much.) Maw of the Obzedat: This guy just makes everything a nightmare for your opponent
Each player can make their decks fit how they like to play, whether defensively, offensively, or somewhere in between
And you need to be willing to put in the work