My recommendation is to follow these instructions: 1-20 Sleeve and store in a side-loading binder 20-100 Sleeve, toploader, and secure storage 100+ Sleeve, toploader, and dedicated secure storage Grails / highly valuable cards Sleeve, toploader, and eventually a graded slab If you dont have a standard transparent penny sleeve at hand, every modern ETB offers a selection of sleeves
So you just pulled a shiny card from a booster pack and now you are staring at your sleeve collection wondering which one fits
Some Normal Monsters are also Tuners or Pendulum Monsters, but non-Effect Ritual and Extra Deck Monsters aren't Normal Monsters
Honestly, most people are best served by more than one: For most people : TCGPlayer for fast scanning of ungraded collections, and Misprint for anything you want to dig deeper on, especially graded cards, raw-versus-graded pricing, and vintage
Between format-defining sets, blockbuster Universes Beyond crossovers, and one spectacular disaster, there's a lot to sort through