bloomburrow collector booster box case Boosters – Mox Boarding House and salvation falls on the shoulders of its smallest protectors Bloomburrow Case | eBay

A few things I think could make this go from a 4 to a 5 are adding a "NEW" mark when you pull something you don't have, an actual numbered list in the sets to see the missing spots of your collections, and perhaps an actual incentive to ranking up your badge for each set

Pokmon Scarlet & Violet: Shrouded Fable (August 2024) The Shrouded Fable set brings Pecharunt & The Loyal Three from the Scarlet and Violet video game DLC, Mochi Mayhem

This forces them to waste resources playing around it and can even weaken an endboard

Booster Box [Collector] Magic Kamigawa: Neon Dynasty Keep track of your collection value over time

There is a critical cut off point in mana cost where the potency of the card becomes less relevant overall