Well, I finally got my decklist completed the way I want it (until new cards come out of course!) for now. The deck is focused on lifegain and damage prevention, with it's main win con being Test of Endurance. Ol' Foxy Lady herself, Eight-and-a-Half-Tails is a great way to provide protection for ToE, along with any other permanent in the deck.
The deck is well-balanced in it's life gain, damage prevention, spot/mass removal, recursion and win conditions. It also draws a little more than the average mono-white deck with off the wall spells like Armistice and Well of Lost Dreams.
I prefer the larger, more beneficial board sweepers like Martial Coup and Mass Calcify as they are routinely one-sided. And since the cost difference isn't an issue in this format, I see no need to not pay 6 or 7 as opposed to 4.
Expedition Map, Kor Cartographer, Emeria the Sky Ruin, Felidar Sovereign, Luminarch Ascension, Marsh Flats, Arid Mesa, Kabira Crossroads, Narrow Escape, and Eternity Vessel are all solid additions to the deck.
The thing about Sword of Light and Shadow is that once it's equiped to a White creature it'll fall off due to the Pro-white...
Sword of Fire and Ice is much kewler
Actually, this is incorrect. It gives the equipped creature Pro-White and Pro-Black, and the Sword itself is not colored, so the Sword will not just fall off. Sword of Fire and Ice is also a very good equipment, better than L&S imo. Best to have both, though.