I really like this deck idea and the new set just leaked.

Porcelain Legionaire, Phyrexian Metamorph and Moltensteel Dragon are all exactly the kick in the pants this deck needed. Metamorph duplicates your Dragons, Wurmcoils and your opponents Dreadnoughts, Tombstalkers, Progenitus and Emrakuls.

Legionnaire is a fantastic two drop due to the first strike.

Moltentail is a solid 4 drop artifact dragon since it flies and you can trade your life to pump it and do the last bit of damage.

Moltensteel Dragon 4PP
Artifact Creature - Dragon
4/4
(P) can be paid with R or 2 life
Flying
P: Moltensteel Dragon gets +1/+0 until end of turn.

Replace the crappier cards with these and this deck is ready to fly.