Here are the most expensive cards you can find in Prismatic Evolutions, and why they can go for so much
Since a shiny Gyarados is the Hiroshima Pokmon Centers mascot, it was only natural that the key promos included in the box set were centered around Gyarados and its pre-evolution, Magikarp
If you paid the evoke cost, which was usually cheaper, you'd sacrifice the creature when it entered
Non-holos only have thick stamps, sometimes with a 3D effect, which I don't believe has ever been seen on a holo
In a game where a single well-timed negation can ruin your combo and potentially cost you the duel, theres a reason this is one of the most important staple spell cards in Yu-Gi-Oh
On the other hand, it's held back a bit by being a stax piece that lets opponents choose which phase they're least likely to miss that turn