This deck essentially a flying deck that penalises other players for not having flying creatures.Favorable Winds boosts my flying creatures and Gravitational Shift Boosts my flying creatures and screws over non flying creatures. Although unlikely to happen in a game if you had all 8 enchantments out your creatures would get +12/+4 and non flying creatures would get -8/-0.
Soulcatcher and Soulcatchers' Aerie boost birds when birds die, the counters on each of them are increased when Thrummingbird deals combat damage.Soulcatcher's Aerie boosts all birds, further increasing the power of your creatures.
By using Tidal Surge and Deluge you can keep enemy creatures in check.
Coast Watcher should be swapped out for Duskrider Falcon or Freewind Falcon depending on your opponent (or opponents), the key here is to give yourself a flying creature that has protection from the colour most prominent amongst opponent's permanents
Courier Hawk, Skyshroud Falcon and Zephyr Falcon (which could be switched out for Bay Falcon) serve as the main attack force, all three creatures have flying and vigilance and with the number of Boosting enchantments that you should have, will be a formidable in both attack and defence.
Sideboard:Airborne Aid is an awesome draw mechanic that could get more of the low-cost flying creatures out quicker.Judge's Familiar is useful when coming up against a bounce/burn deck
Maybeboard:This section has a bunch of cards that would work alongside much of this deck,Warden of Evos Isle+Stormscape Familiar+Windbrisk Raptor this combo would be excellent, making the big daddy of bird creatures cost 2 less mana (for each warden and familiar on the field)This would also be helpful for playing Aven Brigadier
Having Moat or Magus of the Moat would be amazing, however the expense is too great for me to run moat and the magus is neither a flyer or a bird.
Flood might be useful, but I find that Deluge and Tidal Surge are more cost effective.
I did ponder putting in Celestial Gatekeeper, in case I lost oen of my key creatures, however this card would work much better with Windbrisk Raptor+Aven Brigadier than with the cards in my main deck.