Not only does Open the Omenpaths cast it by itself thanks to the hybrid mana of Vadroks mutate cost, but Vadrok also flashes it back with its trigger
There are enough recursion effects with Monster Manual, Tlincalli Hunter, Crystal Dragon, and Eternal Witness to ensure that you can get them back in the very likely event that you mill these
This is one of the few cards in the deck that have some kind of payoff for voting, so Id rather have it in my command zone where I can cast it at any time rather than lost somewhere among my 99
I do realize that there are additional Ramp decks out there, like Tooth and Nail and Nykthos Green
Spend two mana and tap the card to gain a Treasure token - but only if you can best a literal coin flip first
I concede that tribal sets, like Modern Masters 2013 and Innistrad, tend to have clearer archetypes than most sets