It's not feasible to comprehensively categorize the infinite number of types of misprints that could occur, especially given how rare it is for them to actually be played in tournaments, so WOTC allows the head judge to use their discretion
Like most Pokmon cards, the value of Shauntal depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Paradox Rift)
For comparison, you could buy four 36-pack draft booster boxes of a Standard set like Strixhaven or Kaldheim for the cost of a single 12-pack Modern Horizons 2 collector booster box
While this card shared a similar spike, then dip as cards like Lumineon, the dropoff wasn't nearly as severe, but this card's meteoric rise that began at the end of 2024 sets it on an incredible path to be one of the top Brilliant Stars chase cards