Anime Only
From Yu-Gi-Oh!
There are many cards seen in the Anime that have not been created for the real game yet. Some of them, such as Cursed Twin Dolls and Dark Sanctuary, are quite hard to create a real ruling for in the real game (the latter card might even require the use of paper and a writing utencil so the player can write down which monster to "possess"), so they may never be released.
