So Orchard/Oath is superior to Hexmage/Depths. Both are 2 card combos. Orchard Oath costs

while Hexmage/Depths basically costs

in opportunity cost. Hexmage wins 1 turn faster, but Orchard and Oath are much more useful independantly. For these reasons I doubt that Hexmage/Depth can be better than Oath. I wonder if they can work together though?
3 Forbidden Orchard
1 Bloodstained Mire
1 Wooded Foothills
1 Polluted Delta
1 Misty Rainforest
1 Windswept Heath
4 Bayou
2 Urborg, Tomb of Yawgmoth
1 Strip Mine
3 Wasteland
3 Dark Depths
1 Tabernacle at Pendrell Vale
1 Black Lotus
1 Mox Ruby
1 Mox Jet
1 Mox Sapphire
1 Mox Emerald
1 Mox Pearl
4 Null Rod
2 Vampiric Hexmage
1 Demonic Tutor
4 Grim Discovery
1 Imperial Seal
1 Demonic Consultation
1 Vampiric Tutor
4 Oath of Druid
4 Life from the Loam
4 Living Wish
1 Regrowth
4 Sylvan Scrying
1 Krosan Reclamation
So the idea is to Oath up Hexmage. Then you can ideally Dredge Life from the Loam and pay 2 to get Dark Depths back and you have a 20/20 creature after your first Oath. Ideally you would want Haste. Anger is a creature and Dragon Breath only work on high cmc creatures so neither work.
You still settle for winning two turns after you play Oath. You do get the benefit of having a nice backup plan. You can just tutor up Hexmage and Dark Depths independently. Living Wish finds either half of the combo or Orchard or disruption or removal. Other than Krosan Reclamation there are no dead cards. Reclamation is there so you can put back 2xGrim Discovery and win after Oathing your library.
The list above is barely tested, but I was wondering if anyone was pursuing this at all?