Ok, let's see...
This deck is extremely susceptible to board wipes. You need protection.
Heroic Intervention is great for everything, whether it be protecting your creatures in offence, defense or a destruction spell.
You've got a sort of dragon theme going on, as the title suggests, but your only payoff from having Dragons is
Dragon Tempest, which gives no triggers of any kind to
Scute Swarm,
Rhys the Redeemed, or
Essence Warden.
Everquill Phoenix isn't a Dragon either. So you either want to swap out those cards for more dragons or remove
Dragon Tempest which at present seems like 4 wasted slots.
Duel Casting only combos with
Rampant Growth and
Spitting Image, and requires you to tap the creature to use it. You can remove that, since your deck's theme is creatures, not instants/sorceries.
The key to a good deck is cohesiveness, and right now this deck looks like it's trying to do a couple things at once, those being dragon/flying synergy and creature tokens / duplication.
I hope this advice helps make the deck more effective. Good luck with it!