If, for any target, they can't choose a new legal target, then it remains unchanged (even if the current target is illegal)
I honestly dont know, except to say that purely casual players are confusing beasts
According to Michael Halperin, a spokesman for Heritage Auctions, only 10 of the 39 cards are known to still be in mint condition, while it's uncertain how many of the remaining cards are privately-owned
Except Nanako is the main character's 6-year-old cousin, whereas Naoto is a detective with a gun
They are still designed in such a way that Card not found is not strictly better than any of them, though
But my only focus right now is my rarity collection (and I sometimes buy cool Yu-Gi-Oh products, like the Legendary Decks 1 and 2 boxes)