Everyone playing Magic: The Gathering knows that each expansion is released mainly through booster packs like the one seen here. Many game expansions do have pre-made decks of cards, though there are also players who prefer to build their own decks through trial and error.
It doesn't matter which type of player you are: the one who likes pre-made decks or the one who likes to create their own deck. This booster pack is good for both types of players for the booster pack helps folks to improve the decks they already own or have built.
Considering that the Kamigawa Neon Dynasty expansion of the Magic: The Gathering TCG has 540 Magic Cards, it goes without saying that you need many boosers packs until you can say you have all the cards in the expansion.