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Even if Vivi's premise is relatively straightforward, that doesn't stop it from being a devastating force if left uncontested, both creating an absurd amount of mana for you to combo off with and dealing massive damage to opponents without much effort, especially when combined with spells that can quickly pump up Vivi's power level
Well, except the Shields package, of course
Elesh Norn, Mother of Machines - $170.10 Version: (Borderless) + (Step-and-Compleat Foil) Probably not coming as a surprise to many people, the new Elesh Norn is quite high on the list and has the number two spot by a great margin
The magnetic case holds the card securely, lets you display it flat without bending, and protects the surface from scratches and handling