The most valuable Japanese Scarlet & Violet 151 card is Booster Box, currently worth about $293 raw
Typically higher valued than their non-shiny counterparts (with the initial first edition Charizard card being a clear exception), these cards often trade for several hundred dollars
For example, Bribery in the Introducing: Kaito Shizuki drop has a market value of about $30, the same price as the drop itself
GameStop 2002 Pokemon Japanese Theater Limited Vs 007 Annie's Espeon PSA 10 Current price: $387.99 From GameStop Loading Inventory
If a player lacks enough energy to retreat a Pokmon or wants to conserve their energy, X Speed becomes an invaluable tool
However, based on the official statement, it appears Nanahara was given reference material to make the card