For example, Marvel Super Heroes Collector Boosters can contain cards from the main set, the bonus sheet, the Commander precons, the Jumpstart Boosters, and the Scene Boxes
You can check out everything you need for Disney Lorcanas new set right here
The Barcode is the only of these 3 to also use the Thin Black Border instead of the Thick/Standard ones
The second number is the number of cards in that set
You might not have an urgent need for a specific card on turns 2-4, so rather than potentially wasting a tutor on a card that could be rendered useless as the game develops, you can simply set yourself up to make a more informed decision later
it won't, of course, be alone in your lists