You can rest that Character and use Sanjis Rush attack to KO it, or at least force Counter cards from the opponents hand
Either way, Vivien can completely swing the momentum of a game the turn she hits the board
More colors often slow the deck down since they need lands that enter the battlefield tapped
On the front side she makes sure you hit a land drop, and then when you transform her into Roar of the Fifth People, you generate two dinosaurs, then all of your creature turn into mana, then she tutors up a dinosaur, and she finishes things off by giving them all double strike and trample
Lol actually, if I had bought any of them, then Id probably be the only person in the world to actually make NEGATIVE money on their own fake cards
Linvala, Shield of Sea Gate Another card to maximize with a full party