Greninja ex is card #54 of 215 in Scarlet & Violet Black Star Promos (2023), a Promo illustrated by takuyoa. At about $5.49 it is the #48 most valuable card in the set. It is one of 36 Greninja cards printed so far.
2013XY Black Star Promos
2014XY
2017SM Black Star Promos
2018Forbidden Light
2021Fusion Strike
2022Astral Radiance
2023Scarlet & Violet Black Star Promos
2024Twilight Masquerade

















See the full Scarlet & Violet Black Star Promos card list
An ungraded Greninja ex from Scarlet & Violet Black Star Promos sells for about $5.49. A PSA 10 is worth more, roughly $19.21 by our estimate, and a PSA 9 around $10.98.
It is a Promo.
takuyoa drew the art for this card.