vulpix basic pokemon card Base set corrected Vulpix, what do you think its worth? Seen alot of different prices! : r/pokemoncardcollectors Evolves from null Type Vulpix - SWSH12: Silver Tempest

They are legal in whatever formats the cards are already legal in

Flareon (Gold Star) from Power Keepers valued $380-$3,000 PSA 10

Some of these cards may have price tags that are leagues above the rest, like For those that do spike in price, thats a function of the underlying utility of the card - not the collectibility of their category

The cards, and sometimes the mechanics themselves, were poorly developed and ruined the formats of old

For four mana, one of which is Phyrexian Blue, this card can be transformed into its Phyrexianised side

More often than not, they can restrict your deck building choices and homogenize your gameplay experiences