There arent many examples of cards that feature blood, but there was that time that Soul of the Pure which is named Angels Lifeblood in Japanese got a little too grisly for the censors
Some of its great original cards have become powerful in other formats, like Allosaurus Shepherd
Guardragon The final archetype of the lore is one already seen through World Chalice Guardragon and World Chalice Guardragon Almarduke, but now has proper cards to make it a real archetype
Yugi asked who he, to which he replied that it would all become clear in time, just as soon as Yugi joins the game
A shop like Weevil Cards & Collectibles, with a real storefront and real hours, does
"Hideaway N" means "When this permanent enters, look at the top N cards of your library