Cream of the crop May help you powering through.
Oath of druids have won me some games, too. Many of the creatures I run, have build in self protection, so I don't have to spent a Turn for casting ascetism or similar stuff and can keep the pressure on me oppenents insteat. I run a relative high number of tutuors, which can find
prowling serpopard if needed.
Mana vault is a nice card, because it can lead to a Turn to xenagos. But after this, you will still be on three mana on Turn three, and can't Start the pain-train running. Perhaps this gives a slot for a fast mana replacement. Perhaps you can visit me xenagos list to Check my "Interpretation" out.