The most plausible explanation was that the purple sticker sheet was used in a different print run which used striped collation (see The Collation Project for the explanation on how this works)
Fun fact: Chandelures flames burn hotter when its excited, making it both beautiful and mysterious
(I have a spare playset set aside for just this occasion, I must admit!) Ive written before about the lows of a set being around two sets later, but Im going with 4-6 months now as sets are coming out at a breakneck pace
A cards legality status is not based on which expansion its from
To be clear, regulation marks themselves are not the reason for increased value , as an older card may be valuable due to its rarity, set or character popularity, or even physical traits like misprints
What's in a Strixhaven Theme Booster