Serra (Magic: The Gathering)
Serra represented on her Vanguard promo card (not tournament legal.)
In the collectible card-game Magic: The Gathering, Serra was the creator and overlord planeswalker of the artificial plane Serra's Realm. Both played an important role in the post-ascension life of Urza.
Read more about Serra (Magic: The Gathering): On Serra's Realm, On Ulgrotha, On Dominaria, Serra's Death, Serra's Return