So, for this kind of deck, you want to have a solid first turn play so i would take out the Armada Wurm s in favor of 2 more Experiment One . Also, seeing as wayfaring temple is a worse version of the Voice of Resurgence elemental, I would pull it in favor of one more Brimaz, King of Oreskos and one more Trostani, Selesnya's Voice . I would also abolish Grove of the Guardian and Karametra, God of Harvests in favor of 2 Mana Confluence . The fixing can really save you at any point in the game. The last suggestion i have is to simply knock out all of the growing ranks for a playset of Sylvan Caryatid you run on the slightly lower side of lands, so sylan is a great way to not only color fix, but it's an excellent hexproof blocker on turn 2.

cool deck though. I hope you can make it better through everyone's suggestions. I love the idea of selesnya decks in standard.

Wake the Reflections is one of the best populate cards because it has a CMC of 1. The only downside is that it's at sorcery speed, so I would suggest Druid's Deliverance . For only one more mana it both stalls your opponent and gets you another creature (potentially a 5/5 warm or 8/8 elemental)

Eidolon of Countless Battles maybe?