That scarcity is a big reason the top singles held value while many larger modern sets flooded the market
Despite being a modern card, Lillie's Clefairy-ex is valuable thanks to its wide appeal
If no worldwide synced releases are possible, how about worldwide synced rotations
Lugia EX Full Art, Ancient Origins #94/98 (2015): ~$175 The XY-era entry, riding the same under-opened-era revival lifting its Rayquaza and Gengar contemporaries
While the card pool may be small, obtaining just one copy of this can be difficult
These events are varied and encompass both advanced-rule TCG formats as well as Rush Duel, alongside all-new formats with their own quirks for people seeking out something different, such as two-versus-two duels with their own rulesets