Horsea is card #116 of 165 in 151 (2023), a Common illustrated by aspara. At about $0.33 it is the #138 most valuable card in the set. In a 151 booster it turns up about once every 15 packs. It is one of 28 Horsea cards printed so far.
1999Fossil
2003Aquapolis
2006Holon Phantoms
2010HS—Unleashed
2015Primal Clash
2018Dragon Majesty
2022Lost Origin
2023151

















An ungraded Horsea from 151 sells for about $0.33. A PSA 10 is worth more, roughly $1.16 by our estimate, and a PSA 9 around $0.66.
It is a Common, and it shows up about once every 15 151 packs.
aspara drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open 151 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.