different types of rare yugioh cards How To Understand Yu-Gi-Oh Card Rarity Ultimate Rare | Yu-Gi-Oh! Wiki

With all that said though, theres a small part of me that wonders if it may just be hype

Using his mind puppet Strings, Marik used "Slifer the Sky Dragon" against Yami Yugi, but he was ultimately defeated via Deck out by using the effect of "Slifer" against him

it is Hot Foil Stamping

Not only was the Charizard card a holo version also known as a shiny Charizard, which is considered to be one of the most popular cards on the collectors market it was also shadowless, meaning that a printing error had occurred in the making of the card, leading to there being no shadow behind the image of the Pokmon, making even rarer