Several factors influence Obsidian Flames 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
Both Green and blue didn't have options that were quite as obvious
Its important, of course, that the one-of-one copy of the Magic: the Gathering One Ring was just a super rare version of the card and not the only mechanically-unique The One Ring to be printed, meaning anyone that just wanted a version of the card could get one fairly easily (yours for 55.29 on this very site at time of writing)
Currently, only two cards have managed to make it past the $100 value, and they are both Greninja ex cards
In the Unstable boosters you can find foil tokens for the first time
I-its not like were addicted to cardboard or anything)