These price increases are likely the result of players picking these decks up as their intro to competitive Pioneer
It was first introduced in the Kanto region in Pokmon Red and Blue, and has since been found in various regions, including Johto and Galar
Red often requires you to discard as part of the bargain, sometimes giving you card "selection" but not actually card "advantage." Black is the most likely to cost you life and White is just the worst, often having to rely on shutting down an opponent's extra draw in order to get your precious extra cards
But investors both in and out of Magic are waking up to the massive potential of these cards in a bullish collectibles market and of many other cards from this mid-90s era that have never been reprinted since
Boasting even more utility as a threat and tutor, its almost a wonder theyre not played more
When looking at the art on Flotsam and Jetsam, the hench-eels of The Little Mermaid villain Ursula, we can see that it was actually stolen from Ariel