They are part of the eternal or Commander set, and mainly distributed in paper by the scene boxes themselves, or filtered into the probabilities of the collector boosters
the actual pull rates for some cards all but ensure the chances here are vanishingly slim
collectors actively pay premiums for well-placed swirls
Sometimes these are called: Holofoil cards Holographic cards Shiny cards Foil cards There are a few different types of Holo Pokmon cards: Holo: The Pokmon image is holofoil Reverse Holo: The frame around is holofoil, but the Pokmon image itself is not
In the anime she pretends to be in danger to no avail, goes to the Ferris wheel before the warning's put out to sulk over not seeing Yami Yugi, and is targeted by happenstance
First, there's Eatgaboon which pops a 500 or lower ATK monster when it is normal summoned that depicts a live rat getting eaten alive by some bizarre mutant mouth thing with tentacles or guts or something ensnaring its hapless prey