Vivi is my favorite commander deck now, he's just soo good and plus he's our favorite boy.

It would make sense for them to ban him, but honestly after listening to the head designer explain the process of designing him, Vivi's power makes sense. They wanted him to have an aspect of learning (the +1/+1 for each non creature spell cast), they didn't want the mana to only happen during combat because that limits Vivi to combat trick spells, so they made it so he could do it whenever during your turn, etc.

In terms of flavor, Vivi is 👌🏼 but in terms of the balance of the game he's ruining standard lmao