Another possibility would be more Collectors Edition cards (with gold borders)
Flavor Text "Dormi bene, e che le ombre ti accolgano." P/T Number 577 Language Italiano Legal Formats Alchemy, Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Rulings (6/6/2025) If the target creature is an illegal target as Y'shtola Rhul's ability tries to resolve, it won't resolve and none of its effects will happen
It could be because the facial expression is a classic ugly bad guy from countless anime, but seeing this face on a beast rather than a person makes it even more unsettling
Witch's Apprentice X DARK Level 2 [ Spellcaster / Effect ] ATK 550 DEF 500 As long as this card remains face-up on the field, increase the ATK of all DARK monsters by 500 points and decrease the ATK of all LIGHT monsters by 400 points