Not only does he disable all of that companion's card bonuses for the turn, he also constricts card flow and makes twilight if the player replays the cards next turn
TINKER BELL VERY CLEVER FAIRY This resourceful fairy helps keep you moving as you race across the Inklands
The cost of may not sound like much, but any equipment that raises Esper Sentinels power will get the cards flowing your way very fast
Whether you're running Amethyst/Steel control or Amethyst/Sapphire"Blurple", these cards are non-negotiable additions to your deck and some of them are flying under the radar while everyone's distracted by the other flashier reveals
Dishing out damage with each spell cast makes Vivi a viable win condition in itself, especially paired with cards like Ojer Axonil, Deepest Might to ratchet it up
Making tokens is great with it, putting extra lands onto the battlefield is great with it, and it can sometimes be hard to turn these things into real material gains so sometimes you can get a lot of them at a pretty low rate