so why exactly did you decide to add Yavimaya, Cradle of Growth to this deck? I don't really understand the use of it without some sort of Cabal Coffers for green, am I missing something?

Titus78 fair question. For 2 reasons:

1. This allows all of my lands that either add only colorless mana or don't tap for mana at all to generate green. With kamahl's abilities, especially animating lands, I need green sources; this makes it easier to figure out what to tap and leave open in case I don't have a huge mana source in play.

2. With the addition of Arbor Elf , I can untap both Gaea's Cradle and Nykthos, Shrine to Nyx with yavimaya in play, making it easier to generate huge amounts of mana.

You can try the Umbral Mantle + Llanowar Tribe Result: Infinitely large creature, or same combo with Karametra's Acolyte at devotion to Green is at least Four Result: Infinitely large creature and Mana add this with trample and watch the game end XD

I'm working on an optimized/competitive build and will probably throw that combo in there. I'm trying to avoid a bunch of infinite combos in this build as it gets out of hand in my playgroup as is. It's the reason I dropped Staff of Domination . Thank you for the suggestion though!