The card also has her catchphrase: spoilers! as she warns The Doctor that she cant tell him what she knows of his future, appropriately rewarding you if your opponent tries to take a peek at the cards in their library
"[Type]cycling [cost]" means "[Cost], Discard this card: Search your library for a [type] card, reveal it, put it into your hand, then shuffle." This type is usually a subtype (as in "Mountaincycling") but can be any card type, subtype, supertype, or combination thereof (as in "basic landcycling")
However, the mechanic itself has been in the game since it was initially released
Challenge : If your opponent has an exerted character card (from questing, using abilities, or other effects) then you can challenge them by exerting your characters on your turn
For example, more powerful cards always have a fairly high wow factor because powerful cards tend to be expensive, and owning foil copies of expensive cards is more impressive than owning foil copies of cheaper cards
Card not found is, besides Card not found, one of the big favorites for cheating into play through reanimation or other ways