So, this is the final version of my Nature, Water, Dark Control, it works very well, iam prepared for nearly everything:

3x Burning Mane
4x Bronze Arm Tribe
2x Barkwhip

2x Fighter Dual Fang

4x Mana Nexus
1x Natural Snare
1x Dimension Gate


17

4x Emeral
4x Aqua Hulcus
4x Corile
2x Illusionary Merfolk

1x Crystal Paladin

1x Crystal Memory

16

2x Vampire Silphy

4x Terror Pit
2x Lost Soul

8

Manacurve:

2 = 9
3 = 9
4 = 6
5 = 6
6 = 7
7 = 2
8 = 2

And I wont go mono :)

looks pretty good but I would suggest putting in some Natural Snare...

I would like to put in two Snares, but I dont know what to put out.
Besides, it would destroy the manacurve :)

well, mana curve really isn't a problem...I'd say drop either fortress shell/barkwhip or FDF...

I don't think you need Fortress Shell, just use Barkwhip, also use 4 Natural Snare and some Blockers like Hunter Fish or Bloody Squito, Crystal Memory can be also very helpful.

So, I made a few changes ;)
works pretty perfect for me :)