Feel free to give me advice and opinions!

First off, hydras > others. I used to have a hydra deck so I love the style. Protecting your hydras from removal is gonna be your key to success. Vines of Vastwood is a great, cheap spell to ward off spot removal. Rogue's Passage is a good way to work around nasty combat tricks your opponent may have. Also, Wrap in Vigor saves you from board wipes, which would otherwise be a big problem.This is a really fun style to play. I hope these suggestions prove helpful to you, best of luck!

Oh, I almost forgot: Summoner's Pact is a nice spell for grabbing your hydras, and since you produce a lot of mana, the condition cost shouldn't be a big issue.

lkraatz Thank you for your help! Yes hydras>others for sure, i also thought i may add Not of This World this card should work well with ascetism, for protecting my hydras, what do you think about the other cards in my main board, if you where me what would you remove from the main board?

you could consider Greenweaver Druid.

Thank you Kala for your suggestion!

You should run 1 or 2 Swamps in your list.

This will allow you to get black off of Cultivates and Rampant Growths.

I cannot believe I didn't think of that. Thank you phockhousen!!

Hello GregGreg! I really recommend one or two Essence Harvests. You can easily 1-shot your opponents wiht those and your hydras :)

Thanks MightyMarbs for your suggestion!!

Hardened Scales ?

bepsss i find Hardened Scales a good card but slow in my deck, i use to double the counters on my creatures with Kalonian Hydra , Primordial Hydra or Corpsejack Menace abilities and Solidarity of Heroes and Bioshift in combo with Corpsejack. It's a good card but Imho not so good in my deck.

If you think it's worth to play It, what i have to remove from my 60 card?

Thanks for your suggestion!!

Perhaps for your sideboard you could consider Fate Transfer to steal opponents' counters, and Guttural Response and/or Vexing Shusher for countermagic.

Zeke_0 Thanks for your suggestion!Thanks Thanks Thanks!

Damn! This deck looks really nice! I'm at newbie at MTG, but I would love to try this one sometime, it sure looks fun! :D

sonateroarctico it's really fun! XD and thanks for the like!

Nissa's Pilgrimage is better than Cultivate in every way (in this situation).

Slurpeee Cultivate lets me bring out a swamp if i need it, i don't know

Harrow might be better for the early game, since you get two lands untapped, although you sac one land.

Slurpeee Harrow is a good card, for me it's very important to bring out Corpsejack Menace in "early" turns (before the hydras) thank you.

I like your Hydra deck, I made mine fairly recently and it's a really fun style. I don't know if you think it would fit well enough because yours isn't mono-green, but I have Karametra's Acolyte in my deck. This has been really helpful for having my hydras start with a good number of counters even early game.

Something else that I have found to be really nice is replacing Solidarity of Heroes with Gilder Bairn to double my counters. If you enchant it with Karametra's Favor, you get to draw a card and it allows you to tap it without attacking (essential). Since tapping Gilder Bairn gives you a mana, his ability now only costs you 2 mana. You can do it as many times as you want for 2 mana per like Solidarity of Heroes, but it stays on the battlefield to be used over and over and over again. This would be even better for you because you have cards that would make it quadruple instead (like Corpsejack Menace).

Bonus: Use it a few times on Gyre Sage and then tap Gyre Sage for a bunch of mana and keep going!

The awesome part is that you can even turn it into an infinite combo by playing the enchantment Training Grounds to make Gilder Bairn's ability free if it has Karametra's Favor on it. Infinite counters for all your creatures!

Feel free to check out my hydra deck, Karametra's Devoted Hydras, to compare them and see that combo. Suggestions are welcome on mine as well. I got some great ideas from your deck, so thanks!

Graldorf Thank you very much, very nice suggestion!

Im currently using similar deck. I was playing Sultai also but since land are so freaking expensive i had to drop to two colors to keep the tempo up. Consider adding Prime Speaker Zegana, you have no card draw.You will struggle against early removal, killing mana dorks basically shuts down your entire plan. However im impressed with Bioshift trick and i must try it in my hydras Golgari Hydras Midrange :D

Thanks Motys for your suggestion! I'm going to add Vines of Vastwood to protect my creatures from early removals, and/or punish my opponents with Summoning Trap, (you kill my little bird?? Now face this hydra!) and i don't need very much to draw cards with this deck. And yes Bioshift in this deck is really useful and powerful.

Whisperer of the Wilds could work in here as well. either way it'll produce mana. i use Vernal Bloom in my casual hydra deck to help ramp up any hydras with X in its cost as well.