Your deck pic is of a magic deck, but your link does go to the amazon deck.

And yea, Amazon just doesn't have the tools to be midrange. The only amazon decks that (sort of) work cap at 5 mana. They got a lot worse with the Arkmonian nerf and they weren't that great to begin with. Hopefully, they'll get more love in future sets. Warrior of Paradise is a really solid card (ditto Barksworn Hunter).