Imo only thing this deck needs is a way to get those 2 drops past opposing Mantis Rider. You dont want to play 2/x in a world of x/3, if a mantis rider would stay as a best flyer. I could think only about Spear of Heliod or Hall of Triumph, those however have obvious flaws in themselves (one makes mana almost impossible, other doesnt work on all creatures). It could be fixed by stuff like Ajani.
If only Favourable Winds was format legal ...
Dont forget this colors gives access to both Bident of Thassa and Millitary Intelligence as a nice way to get card advantage, as well as Illusory Angel (dont know if it can work however).
Also we had a guy that played in every top 8 in our WMCQs this year, featuring this deck:
[deck]Lands (20)
3 Shivan Reef
3 Battlefield Forge
3 Steam Vents
3 Hallowed Fountain
2 Temple of Epiphany
2 Mutavault
2 Darksteel Citadel
2 Mana Confluence
Creatures (10)
4 Goblin Rabblemaster
4 Ornithopter
2 Judge's Familiar
Other Spells (30)
4 Raise the Alarm
4 Shrapnel Blast
4 Boros Charm
4 Stoke the Flames
2 Military Intelligence
1 Gods Willing
3 Ensoul Artifact
3 Springleaf Drum
3 Shock
2 Negate
Sideboard (15)
1 Hour of Need
1 Chandra, Pyromaster
2 Skullcrack
2 Wear // Tear
2 Spark Trooper
2 Dispel
2 Flames of the Firebrand
3 Hushwing Gryff[/deck]
He obviously had some tweeks between 3 times he made to top 8.
He was really fond of boh Shrapnel Blast and Ensoul Artifact. Notice he didnt went crazy on artifacts, he only played 4 Ornithopters, 3 drums, 2 darksteel citadels and later 2 mana filter mana artifact that draws you a card on etb (forgot a name). We have quite nice artifact now in Ghostfire Blade (1 mana +2/2 equip 3/1), maybe it can work?