Thinking of changing my Spirit Deck

[Ping]

Currently I am playing a green/white spirit deck that was modified here and is now actually a decent deck!

But I noticed something, my strongest creatures are Kodama of South tree, root runner, and moss kami...

Well, I was thinking, should I throw in a kamigawa dragon or two?
Add in some new spirits from betrayers?
Or switch one of my colours to black like I had thought.

This is my current deck

Land:
11 Plains
11 Forests
2 Elfhame Palaces

Spells:
4 Kodama's Might

Artifacts: 4 Long-forgotten goheis

White creatures:
4 Lantern Kami
4 Kami of Ancient Law
4 Kabuto Moth
2 Kami of the Painted Road

Green Creatures:
3 Rootrunner
4 Kami of the Hunt
2 Kodama of the South Tree
2 Burr Grafter
3 Moss Kami

I have most spirits from most colours in champions of kamigawa, and i can buy betrayers stuff, so I need some help to actually be able to take on some other creature decks >.o

I've never won a match with this deck, but I'm not decicrated anymore

 

[Istanbul]

If you have the money and opportunity, substitute in two copies of Yosei for the Kami of the Painted Road, and two Jugans for two Burr Grafters.

 

[Limited]

Needs more arcane trickery!
I'd put some Kodama's Reaches in there and probably two Wear Aways. I am still uncertain about Unchecked Growth, but you could try it.
Nastiest would be Vital Surge; just two is enough to get massive lifegain..