I am an inexperienced player myself so I am not sure how much my knowledge is reliable, but here goes:
T1 - I would get rid off Spearmen. Windweavers, Shaman and Surge of Light is pretty much all you need to get to T2 and T3. I would also add Dryad (blue) for 25% dmg reduction.
T2 - you seem to be on the right track, but I question Frost Mage as it is T1 card.
T3 - I would get rid of Equilibrium (Surge of Light and Regrowth is all you need for healing spells), I would not use Amii Monument (I think it is just too expensive in terms of void power). What I would definitely add is Shrine of Memory - you need void manipulation and specially in T4 if your units die - Shrine of Memory will be a huge help to get back your resources that much faster. Also get two of them just to keep the effect active at all times. What I also like to use is Construction Hut - speeds up building construction time and reduces the cost.
For units - get Swamp Drake. While it is not very durable, it can dish out a good deal of damage and also put targets to sleep. For ground units I like to use Deepcoil Worm, it is quiet expensive though.
T4 - get rid of Giant Wyrm (Gemeye does the same job, but better), also get both types of Gemeye - I think that is very powerful. What I like to use is Grinders in front as they are very tanky and heal themselves, while Gemeyes at the back dishing out damage from nice safe distance. I don't think you need Grimvine as Grinders are better in my opinion. You need to max out the amount of Regrowth spells you have, at upgrade 3 with max number I can cast it 12 times.
Crowd control cards are vital, specially near the end of the match, The Incredible Mo (statue) is nice too if you have space in your deck, it can reduce damage done by enemies by 20%. I do not recommend using any towers in rpve.