As for Vivis second effect, you may rest Vivi to give one of the opponents Characters a -2,000 Power reduction, and you can give the Rush keyword to a Character that doesnt have the When Attacking effect
The only downside is losing some life, but losing life has always been a black thing, and if you like playing black (or for the matter, Magic: The Gathering ), remember: life is also a resource
While you do finish out the rest of your first game without the guidebooks help, I recommend continuing to work together for the rest of that game and deciding that who wins or loses doesnt count especially if both players are new to the game
Lastly, I want to touch on a noteworthy Commander 2019 card
This is a wild new archetype based around something old and something new and it's going to be exciting to see how it develops