Why not Birds of Paradise over Sylvan Caryatid ? Also if you're willing to lay down some cash then Noble Hierarch would be great as well. Wall of Omens is counteractive to your gameplan which is smash your face in. Defenders can't do that. Same goes for Sylvan Caryatid .

Also I would put in Loxodon Smiter , although I'm not quite sure where.

I don't really understand what Arbor Colossus is doing in this deck. I'd much rather run Advent of the Wurm . It costs one less, Can be put out at instant speed, and has trample.

I use Sylvan Caryatid because it is also a blocker to help stall early aggro. I wouldn't block with Birds of Paradise unless absolutely necessary.

Wall of Omens is my only cantrip, and fulfills the same stalling purpose as Sylvan Caryatid .

Loxodon Smiter as a 3-drop ultimately wasn't as useful as Dauntless Escort , considering my biggest problem is removal. The other 3-drops aren't viable to replace with Loxodon Smiter . If I had a sidedeck, I'd put him in it, though.

Arbor Colossus is there because he's my trampling game-ender (with Selesnya Charm ), and he also blocks big flying guys. I have enough creatures to fill the same purpose that Advent of the Wurm would. If the token was also green/white, he'd definitely be in here, though.

Also, with Gaddock Teeg on the field, Advent of the Wurm can't be cast.