This is a green, white, and blue Ally deck.
If you arent familiar with Allies, every time that another Ally comes into play, their ability is activated (in most cases), or they do something (eg generate mana or draw cards) equal to the number of Allies you control by tapping them.
Basically, they are awesome.
All the little tricks explained:
Amulet of Vigor is in there so that the special lands, which come into play tapped, start untapped. It's not crucial, but its a nice touch.
Khalani Gem is nice, because it basically costs two (you get two mana out of it) and you can choose any color. It returns two lands to your hand. If you havent played a land the turn that you play it, it basically costs 1, because you can tap four, take up two, and then play one down again, and then tap the land and your gem for three. if you take up the Refuges, you gain more life.
Explorer Scope lets you get more lands out, and know what the top card of your library is. It's helpful for planning your next turn and whatnot.
A lot of the creatures that i have get +1/+1 each time an Ally comes into play. That serves to quickly buff them. Other than that, I have a couple of allies to let me do things such as gain lifelink, gain life, gain flying, gain vigilence, etc.
The lands are interesting. If you do the math, i have a 5 green mana to 7 green spells ratio, a 4 to 3 for white, and a 3 to 4 blue (that isnt including my harabaz druid or khalani gem). Despite that, i have the standard 2 to 1 card to land ratio. It's super nice, because I am never without the mana type I need, despite running three colors.