Like most Pokmon cards, the value of Regirock depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Holon Phantoms)
While the set does not officially label cards as Secret Rare, several cards function as ultra-rare chase cards due to extremely low pull rates
Its a good idea to keep rares and mythic rares in a binder to keep them safe
Infernoble Knights officially debuted in Toon Chaos with Infernoble Knight Renaud and Infernoble Knight Roland , but now that sparks about to become an unstoppable wildfire
Older sets with beloved chase cards can skyrocket (SV-era 151 boxes, Eevee Heroes), while average sets settle near or below MSRP
Wide + tall: tokens and anthems from Thundering Spineback pair with trample from Garruks Uprising so every body converts to damage immediately