Decidueye-GX is card #SM37 of 248 in SM Black Star Promos (2017), a Promo illustrated by 5ban Graphics. At about $9.09 it is the #133 most valuable card in the set. It is one of 21 Decidueye cards printed so far.
2017Sun & Moon
2019Cosmic Eclipse
2020Darkness Ablaze
2021Shining Fates Shiny Vault
2022Astral Radiance
2023Obsidian Flames
2024Shrouded Fable
2026Perfect Order

















See the full SM Black Star Promos card list
An ungraded Decidueye-GX from SM Black Star Promos sells for about $9.09. A PSA 10 is worth more, roughly $45.45 by our estimate, and a PSA 9 around $20.91.
It is a Promo.
5ban Graphics drew the art for this card.