http://www.wizards.com/Magic/Magazine/Article.aspx?x=mtg/daily/ftl/106

"Normally, Arboria doesn't see much play time, at least with the people I know. When combined with the blue Leyline, it becomes "creatures can't attack you", and might completely lock down your opponent on spells."

Sweet! The goal is to land both enchantments on the battlefield, and then do nothing on your turns for the rest of the game. In this way, your opponent won't get the chance to attack you again. Meanwhile, at the end of your opponent's turn, just flash out all the spells you would have played normally. Of course, everything hinges on your Arboria, so your opponent will try to Naturalize it. As Chris mentioned,

"With a Sterling Grove on the battlefield, that's pretty hard to do."

Sterling Grove (and Idyllic Tutor) can also search up your key enchantments, which include your primary win condition, Luminarch Ascension. With no damage coming your way, the Ascension will soon be in Angel mode, and you can pump out the 4/4 flyers. Of course, Arboria also prevents you from attacking (if your opponent wises up and does nothing as well.) Flickerwisp (one of my pet cards, and it is amazing with flash) can temporarily exile the Arboria, leaving the skies clear for your Angels to cruise in.

Cultivate and Ãhersnipe are both excellent with flash. The white Leyline can prevent burn from stealing victories away, and it helps the Ascension get online. Overall, a nifty take on Arboria!