I think we absolutely have a Vivi problem. Not sure what they were thinking with 0: create mana ever being printed on a card, but it's clear they (and all of us too) never saw the interaction with Agatha's Soul Cauldron.
Cauldron will most likely eat a ban to pay for Vivi's sins, but here we are. They won't ban the card while it's being actively sold and opened imo, and certainly not from the FF set.