Here are some of the key entries and their notable variants: Eevee Gem Vol
I dont think that Den of the Bugbear is great because its efficient and powerful to activate, I think its great because the opportunity cost in aggressive red decks is incredibly low and it offers something to do with your mana when you flood
These two princesses feed into each other well, with Moana serving as a great way to generate lore and Mulan proving her mettle in challenges
The following sets are excluded due to a lack of pack price data but deserve honorable mentions as some of the most valuable EX-era booster boxes: Team Rocket Returns, Holon Phantoms, Delta Species, Legend Maker, Crystal Guardians, Power Keepers
This little guide will help you better understand all types of card rarity and select the best ones for your collection
For the actual illustration, I paint digitally in Procreate