Horsea δ is card #66 of 110 in Holon Phantoms (2006), a Common illustrated by Atsuko Nishida. At about $44.24 it is the #51 most valuable card in the set. In a Holon Phantoms booster it turns up about once every 6 packs. It is one of 28 Horsea cards printed so far.
1999Fossil
2003Aquapolis
2006Holon Phantoms
2010HS—Unleashed
2015Primal Clash
2018Dragon Majesty
2022Lost Origin
2024Shrouded Fable

















See the full Holon Phantoms card list
An ungraded Horsea δ from Holon Phantoms sells for about $44.24. A PSA 10 is worth more, roughly $575 by our estimate, and a PSA 9 around $177.
It is a Common, and it shows up about once every 6 Holon Phantoms packs.
Atsuko Nishida drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Holon Phantoms booster packs in your browser with the set's real pull rates and keep what you pull in a digital binder. No real cards, nothing to buy.