Horsea is card #137 of 215 in Scarlet & Violet Black Star Promos (2023), a Promo illustrated by Mahou. At about $1.73 it is the #107 most valuable card in the set. It is one of 28 Horsea cards printed so far.
1999Fossil
2003Aquapolis
2006Holon Phantoms
2010HS—Unleashed
2015Primal Clash
2018Dragon Majesty
2022Lost Origin
2023151

















See the full Scarlet & Violet Black Star Promos card list
An ungraded Horsea from Scarlet & Violet Black Star Promos sells for about $1.73. A PSA 10 is worth more, roughly $6.05 by our estimate, and a PSA 9 around $3.46.
It is a Promo.
Mahou drew the art for this card.