Firstly I'm assuming that this isn't a standard deck, rather modern or something. I think that Yeva, Nature's Herald doesn't belong here. I'd replace her for some more early ramp like Llanowar Elves , Arbor Elf , Rampant Growth , Noble Hierarch or Farseek if you're planning on adding another colour.

Kalonian Hydra is one of my favourite cards, but too bad I can't afford them :(

Also for some reason when I went to play test this deck, there was only 1 forest in the deck. Wierd :\

hey thankyou for the comment i will take out the Yeva, Nature's Herald for Farseek and yes i love my hydra Kalonian Hydra and Primordial Hydra are great and is a good combo which is what im trying to make this deck do (which is multiply counters) i havnt been playing magic for long either so i appreciate all help :)

i have also changed it from what i want it to be to what it is right now once i get 3x Primordial Hydra i will take out Voracious Wurm

I'd only say add Farseek if you're adding another colour. Because the only land you can't get with Farseek are forests, which doesn't really help in a mono green deck.

ahh i see, so the question is to myself and you though is i dnt no what colour will be good added to it i was only thing white/blue because of the lacking of killing or counter with spells or red with a Savageborn Hydra but other then that i rckon i should stick with mono green and buy some Noble Hierarch

sorry about my english i suck at sentences

Another option would be to keep it mono green and get some Gyre Sage . With evolve it'll get +1/+1 counters which works well with Kalonian Hydra . Also I'd chuck Naturalize into a sibeboard rather than mainboard.

But it's really up to you which direction your deck takes.

i shall do that that would work great with my plan

Well i ordered my 1 Kalonian Hydra 3 Primordial Hydra 4 Gyre Sage so my deck sgould be nearly done once they arrrive

Why is Voracious Wurm in here, since it seems like you have no life gain? Slitherhead might work well in this deck, considering its a zero scavenge and putting the extra counters on the hydras would be awesome. If you could scavenge that on Primordial Hydra its double would be greater next turn. just a thought :)