Rillaboom

The 2019 SWSH Black Star Promos Rillaboom is a promo Grass-type Pokémon card with 170 HP, evolving from Thwackey, illustrated by Kouki Saitou. Raw near-mint copies trade around $5.85, while a PSA 10 is modelled near $50.85 and a PSA 9 near $23.85. In its original set it is a chase card — roughly a 1-in-466 booster pull (modelled, not official). Rillaboom has 10 other printings in the catalogue.