The fact that it grants Trample as well as Double Strike prevents your opponents from just throwing their pesky 1/1 fliers in the way
Instead of loading up your own creatures, you aim your auras at your opponents permanents and if their mana value isnt higher than the aura's, you just steal them
When you cant keep your creatures on the board, you dont have to worry since youll rely on recovering with Raise the Past to bring almost every creature in your graveyard back to the battlefield
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It sits solidly in casual and mid-power tables
You can currently get a mythic rare borderless Vivi Ornitier card for less than $300, though there are some better (and cheaper) legendary creatures to build a commander deck around