base set booster box pokemon XY: Packs – Plug Moon expansion. Pokemon TCG Sword & Shield

Curious Colossus's ability overwrites all previous effects that set an affected creature's base power and toughness to specific values

These cards can be cast as either side, and if cast for the front side, they can later be transformed by paying the activated cost

Elemental HERO Bubbleman (Mattel Action Figure Promotional Cards: Series 3 MF03-EN007) (PSA 10 Price: ~US$581) In 2006, Konami released 16 North America-exclusive Yu-Gi-Oh TCG cards as part of the Mattel Action Figure promotional card series

It also works with cards like Goryo's Vengeance because its legendary

So I guess it depends on how lax your local MCD management is