how to tell if yugioh card is rare Yu-Gi-Oh Main Set Rarity Guide : r/yugioh Yu-Gi-Oh! Card Rarity: Explained
Description
What It Means : Each Pokmon belongs to a specific type (Fire, Water, Grass, etc.), and this type is represented by a small symbol near the HP

Charizard (Promo): SWSH066 Staff Prerelease $600 The Staff Prerelease promo is a rarity reserved only for event organizers, making it one of the hardest modern Charizard promos to acquire
these (roughly) indicate the monster's relative power, and whether it needs Tributes to be played

The cards might have sentimental value, and the submitter literally just wants them graded and securely cased as a matter of preservation

The deck is built around just four monsters, all of them level 5 or above