With downtrading (trading a small number of cards for a large number of cards) you can ask for ore cards depending on how badly the other person wants your card
Rarer and Rarer Currently, on TCGplayer, the Borderless variant of The Soul Stone has already sold for $500
Illustrated by Kekai Kotaki Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
Without getting into too much legalese, it seems pretty certain that Ravensburger could put a stop to Pixelborn if it really wanted to
However, the card was later reprinted in Japanese as an unnumbered promo card with art by Naoyo Kimura and was one of nine cards in Japan's Premium File 2, which was tied to the release of the Spell of the Unown: Entei in 2000
Unfortunately, I vastly overrated the short-term demand for this card