Its pretty common to be running multiple creatures that have the same name in them, since theyre likely some of the best cards to be playing in that format
It is not allowed in any format and its value lies in its exclusivity
Seven mana for a 15/15 or 20/20 that your opponents wont want to kill is strong, and this card can go wide with a sacrifice outlet, too
Cards like Rapunzel, Gifted with Healing, let you draw and heal, while Elsa, Spirit of Winter, can freeze opposing characters, buying you time to quest safely
Darkness and Metal types were added in the 2000 Neo Genesis set, with Dragon-type Pokmon introduced in 2012s Black & White - Dragons Exalted set and Fairy-type Pokmon and energy introduced in the XY series in 2013