You can quickly establish a good reputation by selling honestly and providing accurate card descriptions
Like most Magic: The Gathering cards, the value of Prismari Apprentice 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 (Strixhaven: School of Mages)
Let's talk about how each card got made: Oriss, Samite Guardian Oriss is an descendant of Orim, Samite Healer from the Weatherlight crewher card appeared in Tempest
Also, you can look on Ebay and Cardmarket to see what they go for there approximately
The first are free-for-all decks trying to let people at the table do whatever they want
That has some implications in burn and aggro decks, triggering prowess and damaging them, or simply rummaging a land away to get more gas