Oath is one of those decks that sounds good in theory but can be hit or miss in reality. For me the tensions are between the counter/disruption package and Oath package. You don't want to start the game with a hand that has all disruption and no Oath, you could have an Oath and a good mix of spells but no Orchards to trigger Oath, or worst of all you can have your Oath targets in your hand!
So for me, Oath is best as a "sideshow" in a deck like Storm. In Storm you aren't so heavily weighted in trying to interact with your opponent, so you're less likely to be in a situation in which you cannot do anything proactive. You have Oath as a threatening turn one play and if it's disrupted then you have Storm to fall back on. And that plan works vice versa; if they have a bunch of Spheres in play to shut down Storm, at least there is always the Oath plan.
On that same concept, perhaps Dark Depths could be another avenue? Could even deploy Loam or Crop Rotation tactics.