This is the record that I'll be updating with any card changes or upgrades.
This is certainly a more casual deck but it's ridiculous when it gets going (nothing truly infinite though). I've found the deck to behave better when built with a lot of land-to-hand searches instead of just playing a higher land count. The primary win condition is Kamahl.
You may also consider running Acidic Slime, it is a utility creature that can be tutored for with sylvan tutor or worldly tutor. Also Tooth and Nail is just house in any green deck.
As far as the style of the deck is concerned, it is a shameless combo deck. I may have come down on your suggestions a little hard thinking the nature of the deck was more readily apparent.
One thing I like about Sasaya (combo version, as I know no other way to build it ), is how cheaply you can get it together. You could probably build a solid version of it for about $30 from zero cards and have the most expensive single be Life from the Loam.
Your deck is most certainly prime, it's just hard for me to think for it, because even though it's mono-green, it's played so differently than any other deck.
Looks like a lot of fun, i want to play it!
Sprouting Vines is good, and it is a card I've wanted to fit in actually but I haven't been trying too hard recently. I agree that it is good in the deck though.
Stampede with Kamahl in play just seems unnecessary. Generally you'll just have enough mana that Kamahl is game over anyway (or similarly, enough tokens with Verdeloth) and without him it's mediocre to bad. In a more traditional deck (Asuza, Patron of the Orochi) with Multani et al it's fiendish to be sure, but I don't like it here.
Helix Pinnacle used to be in the deck but I found if I slow rolled it over several turns it just made me a target, and generally died to a global sweep, and if I were to pay 100 mana into something in a turn there's plenty of other cards with the same clock (Verdeloth) or that'll win on the spot (Squall Line). It's amusing, to be sure, but I don't find it efficient.
I think my New Frontiers is your Rude Awakening.
I just like sprouting vines for that ability to grab the lands into your hands. The rest of the cards were consideration, just cards i've found are useful when you have an excess of mana. And the stampede for Kamahl's land animate, especially with Kozilek out
I'm also guessing you've found winning through kamahl is easier than Helix Pinnacle?
Also Rude Awakening.. oh boy
New Frontiers is played the turn you flip Sasaya to jump you WAY up in mana. Say you play and flip Sasaya with 8 Forests. Tap 2 Forests for 16, New Frontiers for 15, and you effectively 'ritualed' for 29 mana. It gets so much more ridiculous with more mana available. Sprouting Vines isn't bad though.
Time of Need gets anything in the deck I care about (Rofellos, Kozilek, tucked Sasaya, Verdeloth, what else is there?) and I'd rather not kill a draw to get it.
Mana Reflection is good. I don't think it's necessary at all, but it's a good backup plan.
Acidic Slime does too little. Relic Crush and Mystic Melting are way better, and even more so with Mirari. Overwhelming Stampede does nothing. Silklash Spiders is a weaker Tornado Elemental that doesn't do anything off a Chord of Calling. Cloudthresher is even worse in that regard. Hurricane is a worse Squall Line.
replace Time of need with Worldly Tutor
cards to fit in: Mana Reflection, Acidic Slime, Overwhelming Stampede, Silklash Spider, Hurricane, Cloudthresher