Walrein is card #52 of 236 in Cosmic Eclipse (2019), a Rare illustrated by Ayaka Yoshida. At about $0.51 it is the #211 most valuable card in the set. In a Cosmic Eclipse booster it turns up about once every 65 packs. It is one of 13 Walrein cards printed so far.
2004Team Magma vs Team Aqua
2006Legend Maker
2009Rising Rivals
2012Dragons Exalted
2014Flashfire
2015Double Crisis
2019Cosmic Eclipse
2021Chilling Reign

















See the full Cosmic Eclipse card list
An ungraded Walrein from Cosmic Eclipse sells for about $0.51. A PSA 10 is worth more, roughly $2.55 by our estimate, and a PSA 9 around $1.17.
It is a Rare, and it shows up about once every 65 Cosmic Eclipse packs.
Ayaka Yoshida drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Cosmic Eclipse 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.