Much like the Princess Bride Secret Lair drop, all MTG cards in the Monty Python and Holy Grail volumes are reprints renamed specifically for the Secret Lair drop
Granted, if Santa had bells this large on his reindeer wed be a little worried, but this is more like one bell to rule them all, you know
Chatter of the Squirrel - Flashback is strong in this deck
Shuffle the chosen cards into your library and put the rest onto the battlefield
If an effect allows an opponent to cast a spell as though it had flash (for example, if your opponent also controls a Teferi, Time Raveler and activates his +1 loyalty ability), the restriction of Teferi's first ability takes precedence over that permission
You usually see this played with cards that care about cheating big creatures into play, or in Commander decks that go wide