The reason i said it would lose to an aggro deck is because it seems to be pretty slow to develop. But when its set up then it would be pretty tough to deal with. Some mana acceleration (dark ritual) would probably help you out a lot.
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You don't want more lands you want less creatures and spells. If anything I would say to add more lands if you're going to keep the creatures and spells. The deck sounds cool but would probably loose to a well equipped aggro deck. Check out my deck called sligh to get a good example.
I love the synergy with all the creatures and spells. Lightning Helix fits perfectly. Knight of the Holly Nimbus is pretty much indestructible. I think Shocks a little bit weak in my opinion with so many other burn spells. I think Char would be a better fit.
Hey bassman your deck has a lot of synergy but I dont know if the Maro will be enough to take the opponent down. Batman was right, what if your opponent has a terminate, terror, shock/terminate will take out all the weenies but still your deck seems to be quick enough to pump up Maro befores your opponent has time to react. Good deck with a lot of synergy.