Vivi Ornitier's effect is so good, and can be copied onto other creatures (something Izzet Cauldron decks do in Standard), so they too can provide mana to make for explosive turns where you can play your entire hand and draw a bunch of cards
Maybe if it destroyed seven creatures per swing I could see it, but for now, this is a flavor win and nothing more
Now, I want to turn your attention to an upcoming Disney Lorcana event
The most highly prized among the collection is the Enchanted Rare variant of Aurora, Dreaming Guardian, a Sapphire card from The First Chapter that sees Aurora conjuring powers in her sleep
Decks like Jeskai Oculus that want access to three different colors of mana early can make great use of Starting Towns color fixing
Yuna, Hope of Spira Currently at a market value of $275.20, Yuna, Hope of Spira is a creature I believe has a lot of potential