Holon's Castform is an Uncommon rarity Reverse Holofoil card from the Holon Phantoms set, numbered #44. It features unique mechanics tied to the Holon format in the Pokémon Trading Card Game, appealing to both collectors and players. Currently valued at $29.48, this card reflects the ongoing interest in the Holon series, which is recognized for its innovative gameplay elements and distinct artwork. Its market value may fluctuate based on grading and demand among collectors.