As much as I like Vivien's Arkbow, it has never broken out as a competitive card
If youre interested in the actual artistry behind this card art, illustrator Steven Belledin wrote an excellent blog post about his process
The rare collectible was presented to the executive to celebrate his 60th birthday
This is to say that, despite the cost that each draw minimally impacts the composition of the rest of the deck, this deck probably has better mana than a 60-card deck with one less color (Im not sure how problematic needing to fetch four colors instead of three will actually be to how games play out)
Another reason why I do not value it that highly is maybe the fact that I do not own the card in paper and thus have little experience playing with it
Early on, you get a 1/1 flyer for two CMC, which is basically on curve for early sets, with the exceptions of Flying Men and Scryb Sprites, so it can come in early and hopefully do a little damage before eating a Bolt