Tandemaus ex

pop

Secret/special-art rares from Japanese sets have inherently low pull rates, keeping supply tight especially outside of mass-opened sets.

demand

Tandemaus has a modest but genuine fanbase drawn to its cute duo aesthetic, though it lacks the top-tier meta presence or iconic status that drives explosive demand.

artist

The special illustration captures the charming paired-mouse concept with polished composition, making it visually appealing even if the artist isn't a marquee name driving a premium.

catalyst

Future Flash is not the freshest Japanese release at this point, so momentum has stabilized without a strong near-term catalyst like a new meta relevance or reprint scare.