You should definitely run 4x Soulherder . I've been playing a similar deck for a while now and that card wins you more games than any other. Adding Green would give you more cycling lands (you should be running 4x Secluded Steppe and 4x Lonely Sandbar , as they are by far the best cycling lands) by letting you run Tranquil Thicket and Scattered Groves . Coiling Oracle is probably the main reason to throw green in there though. Cast Out is your best removal. W to cycle it, and 4 to take care of any permanent; making it more versatile than your current removal. Bounce lands like Azorius Chancery will let you return cycling lands back to your hand that you were forced to play early, letting you get extra value from them. This might just be a personal thing, but I ran 4x Blade Splicer in my early revisions and it just never did as much as I hoped it would have.

@Saljen Overall i like the suggestions, but i think 4 of both cycle lands will hurt as this deck is more focused on early game to set up the value. I will definitely consider the extra Soul Herder as it seems like a good idea. the Blade Splicer s are necessary as they are the main win con as flicker targets. Cast Out is just a bit too slow and Path to Exile , while it doesn't have cycling, is still very worthwhile as removal, as in the second game there will most likely be enchantment hate now put in.