Each Lorcana starter deck is designed to give new players a full set of cards that is ready to play with right out of the box
Like most Magic: The Gathering cards, the value of Ragavan, Nimble Pilferer depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Secret Lair Promo)
Then you can also toss in venture stuff too, like lands or dorks, or discard dorks like cycling like channel with effects
This strategy takes a little bit of time to set up and get going, however, so it can be a little slow to build up to your larger Ooze tokens
Buyers Guide Quality of Print and Card Stock You've all seen, touched, and otherwise interacted with Magic cards, so you have a general idea of what good versions of quality look like (sans the foil Pringles)