The rarity symbols in Disney Lorcana follow a logic where the more sides the shape has, the rarer the card is
It isnt much to go on, but if you see someone with, say, a large amount of Unglued Plains, Mountains, Swamps, and Islands for trade but no Forests, alarm bells should ring in your brain
Even just one is enough of a flex on your opponent, but if the card becomes unusable in the future, at least it still serves as a valuable collector's item
The degree of the decline and when will depend on the type of card, according to Eugene Smith
Guaranteed Rarity Distribution: While pack contents are randomized, a full box typically provides a more reliable spread of Rare, Super Rare, and Legendary cards compared to buying 24 loose packs from different sources