Windweavers, Shaman, Dryade (blue) and Surge of Light is everything you need in T1 to rush until T4 Camp. Ensnaring Roots and Hurricane are nice to have but just needed against Lost/twilight Souls.
For T2 you have to decide what you wanna play. Do you wanna play Creeping Paralysis and/or Deep One? Get a second Nature Orb and go for Frost in T3 + T4. Wanna have Coldsnap on T2? Build Frost and get your second Nature Orb on T3.
Usefull cards for t2 are Breeding Grounds, Coldsnap, Creeping Paralysis, Curse of Oink, Deep One, Matter Mastery (green), Burrower, Shrine of Memory and Stone Tempest. Aggressor is just a bad and expensive Version of Magma Hurler. Dont spend BFP on it.
T3:
Get Swamp Drake! He dosnt have that mach Lifepoints but he can do a lot of Damage, has an CC Ability and cant be attacked by Units without Ranged Attacks. Rageflame is nice too but expensive in the AH and you need to be (PvE)Level 8 to fully upgrade it. Stone Warrior is a cheap Replacement but your best Option for a Ground Unit would be Deepcoil Worm.
Deepfang or Fathom Lord are ok but i recommend Deepcoil Worm. Or a big neutral Creature like Mo. And get Wheel of Gifts if you have some Space for it in your Deck.
T4:
Grinder, Gemeye (purple) and Regrowth is all you need in T4. And you dont even need Regrowth most of the Time with enough Grinders and the Gemeyes safe in their Back. The Grinders will heal themself with their Ability if you have enough of them close to each other and the Gemeye Range is huge. Grinder is just an awesome Card. The Healing Passive, tanky, does good Damage and can one or twohit every Building because of their Siege Passive.
Dont let anyone tell you that CC Cards like Coldsnap, Creeping Paralysis or else are bad. Sure, you will do reduced Damage on some CCed Enemy but what do you prefer? Doing reduced Damage on Enemys that wont do Damage to your Units for up to 15 Seconds or watch your Units die under the concentrated Fire of your Enemys? A well placed CC on the Key Enemys in a Camp often decides between finishing the Map or not. Especially on Dif 9 or 10.