Dragons finally gives us enough morph and manifests that we can make something really troublesome for our opponents.

Obscuring æther - (registered as Elvish Mystic because it's missing.) morphs for less! Get 3 of these, and they are free!
Whisperwood Elemental - more free morph cards! Plus beat board wipes. Secret Plans and Trail of Mystery - ridiculous card advantage.
Rattleclaw Mystic - mana ramp. Deathmist Raptor - cards that won't stay dead. Sagu Mauler - good luck killing him. Stratus Dancer - counterspell on a flyer! Hooded Hydra - flip up for 2, becoming a 5/5. Dies to make 5 tokens. Den Protector - something died? bring it back!

How do we make this deck better?

Currently we're 100% on the morph theme, but I believe there's cards out there which aren't directly related that will really contribute to the battle.