As the term suggests, the rarities each signify different percentages for how easy or difficult it will be to find one of these types in the booster packs of cards for the game
You won't find value in it every game, especially if you're effectively controlling the board with all of your direct damage tools, but if you find it at just the right time you can gain a two, three, or even four lore instantly, which is often enough to close out a match in a deck like this
You'll want to move as many characters to that location as possible , prioritizing characters with Reckless challengers, low Willpower questers like Simba, Scrappy Cub, and, if you can find her, Moana, Born Leader, who will ready all your other location-bound characters every time she quests
Heres a fun fact: Disney Lorcana features more original art than any Disney product ever created