Castform Sunny Form is card #22 of 198 in Chilling Reign (2021), a Common illustrated by Yuka Morii. At about $0.46 it is the #106 most valuable card in the set. In a Chilling Reign booster it turns up about once every 9 packs. It is one of 22 Castform cards printed so far.
2004Hidden Legends
2005Delta Species
2006Holon Phantoms
2008Legends Awakened
2017Guardians Rising
2021Chilling Reign
2022Brilliant Stars
2024Surging Sparks

















See the full Chilling Reign card list
An ungraded Castform Sunny Form from Chilling Reign sells for about $0.46. A PSA 10 is worth more, roughly $1.61 by our estimate, and a PSA 9 around $0.92.
It is a Common, and it shows up about once every 9 Chilling Reign packs.
Yuka Morii drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Chilling Reign 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.