The other card Prosper narrowly beat out is Toxrill, the Corrosive, another unique card that entices me to build a completely new deck, rather than simply slotting into an existing one
Three support cards specifically work for Kuriboh, not all Kuriboh monsters: The Flute of Summoning Kuriboh (which also works with Winged Kuriboh), Multiply, and Detonate (which also uses Kuriboh Tokens)
The fakes holographic effect is a major giveaway, featuring overly large, unnatural blue sparkles that look printed on rather than reflecting like real foil, and its noticeably blurry text points directly to a low-resolution scan
"The Fang of Critias"+"Tyrant Wing" This card can only be Special Summoned by the effect of "The Fang of Critias"
Consider adding additional elements from your cardmaking supplies
The most expensive card in the Hidden Fates set is Shiny Charizard GX (Shiny Vault)