Dream Trawler

Flying, lifelink
Whenever you draw a card, Dream Trawler gets +1/+0 until end of turn.
Whenever Dream Trawler attacks, draw a card.
Discard a card: Dream Trawler gains hexproof until end of turn. Tap it.

Cloudreach Cavalry

As long as you control a Bird, Cloudreach Cavalry gets +2/+2 and has flying.

Windstorm Drake

Flying
Other creatures you control with flying get +1/+0.

Azorius Guildgate

This land enters tapped.
{T}: Add {W} or {U}.

Surveilling Sprite

Flying
When Surveilling Sprite dies, you may draw a card.

Boreal Shelf

Boreal Shelf enters tapped.
{T}: Add {W} or {U}.

Gravitational Shift

Creatures with flying get +2/+0.
Creatures without flying get -2/-0.

Thunderclap Wyvern

Flash (You may cast this spell any time you could cast an instant.)
Flying
Other creatures you control with flying get +1/+1.

Favorable Winds

Creatures you control with flying get +1/+1.

Empyrean Eagle

Flying
Other creatures you control with flying get +1/+1.

Plains

Island

Healer's Hawk

Flying
Lifelink (Damage dealt by this creature also causes you to gain that much life.)