The Town Duals Rating: 4/10 Mana fixing is always good to have if a land in your colors comes your way, and it can even help you splash a third color
That being said, Quicksilver Elemental does make a good inclusion to any Vivi Ornitier deck
The one 9-ink song in your deck I2I might be very on theme, but its better when sung
Second, you can create a creature token of Basalt MonolithBasalt Monolith or another mana rock, and then untap it using Voltaic ConstructVoltaic Construct
Magic: The Gathering as they are the primary mana source for any deck, but that sometimes leads to the physical cards being practically worthless when a new set launches
Green having sacrifice creatures is rare, so that's interesting, that used to be a thing that's largely gone away