Thats because each box includes 24 Jumpstart boosters, and every pack contains 20 cards, including all the lands you need to play

Draft Boosters 15 Magic: The Gathering cards per booster 1 card of rarity Rare or higher in every pack 3-4 Uncommon cards 9 Common cards 1 Land card (Full-Art Land in 33% of boosters) At least 1 special Borderless card of rarity Uncommon or higher 1 Traditional Foil card replaces a Common in 33% of boosters Set Boosters 12 Magic: The Gathering cards per booster 1-5 cards of rarity Rare or higher in every pack 1 Art Card 3-6 Common cards 1 Land card At least 1 special Borderless card of rarity Uncommon or higher 1 Traditional Foil card 1 token/ad card, Helper card, or card from The List Collector Boosters 15 Magic: The Gathering cards 5 cards of rarity Rare or higher in every pack 5 Uncommon cards 4 Common cards 1 Full-Art Land 10-12 Traditional Foil cards in every pack At least 3 special Borderless cards per booster 1 Traditional Foil double-sided token Commander Decks Two Decks 100-card ready-to-play Wilds of Eldraine Commander Deck

Its a more subtle option than a traditional board reset, but in the hands of a skilled player, it provides the consistency and board presence needed to transition into the late game where blue is strongest
What About Everything Magic Has Ever Printed
[22] [23] Many modern variations on the other cards have been printed, including Mending Hands, Concentrate, Cabal Ritual, and Shock
When Novice Inspector enters the battlefield, you get to investigate, letting you create a Clue token while also getting a 1/2 body early in the game to do whatever you want with