Have you considered Daybreak Coronet? It should work just great in this deck. Since you don`t use black color in this deck, the possibilities are limited, but I`d suggest cards like Magus of the Moat and Ghostly Prison for agro defense - although the Ghostly Prison also works against you... Privileged Position will improve you deck against spot removal, which - along the board removal, as you mentioned - is the weakest part of this deck.
Permalink
Yup, more or less casual - not legal in standard nor modern :/
Added Puresight Merrow
Hmm... the only problem with Kiora's Follower is that I`d have to splash green just for it... Otherwise the card is great for such a deck - thanks for comment and a like!