Here, we just have a bunch of reasonable cards with a reasonable curve. The big payoff? Heliod is pretty nuts here, consistently being a 5/6 indestructible that continues to expand your army while making you resistant to sweepers.

Brave the Elements is just an excellent card and one of the big reasons to play such a deck, blowing open combat, protecting your creatures from removal and red sweepers, and making your team unblockable. Gods Willing doesn't have as big an impact on the game but is still quite efficient and just a randomly good card.

Spear of Heliod is a reasonable card, but we already have plenty of three-drops, so there's not a ton of reason to push the legend rule. You could play a second, but I'm not sure you even want another three-drop. It's not clear if it's better than Ajani Caller of the Pride anyway.

Keening Apparition is a sideboard card that we are going to be seeing more of in the days to come, and frankly maindecking it isn't out of the question. It's just a shame it doesn't trump the Gods.

The straight white version suffers a bit in card quality of course. The two most obvious colors to pair it with are green and red. It would be nice to pair it with black, as black removal is kind of sweet right now, but you don't really get many good gold cards. Most of the good W/B gold cards are more controlling in nature. That said, Soldier of the Pantheon is the kind of one-drop I could really get behind using Orzhov Charm to get back.

http://www.starcitygames.com/article/27031_Theros-White-Green.html