Several factors influence Fossil card values: card condition (mint cards worth 3-5x more), rarity (holographic and rare cards command higher prices), first edition status, PSA/BGS grading scores, and market demand for specific Pokemon
Printing the Duo into Double Masters will hopefully bring that way back down so these fine fiends are more accessible to players who want them
It's clear that the deck was once about creating token creatures and gaining +1/+1 counters whenever possible, but the longer you look at the list of creature abilities or spell actions, the more muddy this goal becomes
While precons are generally weaker than decks created by players, Mutant Menace is strong enough to hold its own without any alterations against non-precon decks
It means Neon Dynasty is a new way of viewing Kamigawa, but it all follows along with the same kind of designs we've seen in recent MTG releases