Greninja V-UNION is card #SWSH156 of 307 in SWSH Black Star Promos (2019), a Promo illustrated by Shin Nagasawa. At about $6.07 it is the #100 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
2019Unbroken Bonds
2021Fusion Strike
2022Astral Radiance
2024Twilight Masquerade

















See the full SWSH Black Star Promos card list
An ungraded Greninja V-UNION from SWSH Black Star Promos sells for about $6.07. A PSA 10 is worth more, roughly $30.35 by our estimate, and a PSA 9 around $13.96.
It is a Promo.
Shin Nagasawa drew the art for this card.