Favorable Winds

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

Healer's Hawk

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

Frost Trickster

Flying
When Frost Trickster enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

Mist Raven

Flying
When Mist Raven enters, return target creature to its owner's hand.

Cloudblazer

Flying
When this creature enters, you gain 2 life and draw two cards.

Battlefield Raptor

Plains

Cloudfin Raptor

Flying
Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)

Cloudshift

Exile target creature you control, then return that card to the battlefield under your control.

Cloudkin Seer

Flying
When Cloudkin Seer enters, draw a card.

Empyrean Eagle

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

Dizzying Swoop

Tap up to two target creatures. (Then exile this card. You may cast the creature later from exile.)

Ardenvale Tactician

Ardenvale Tactician // Dizzying Swoop

Watcher of the Spheres

Flying
Creature spells with flying you cast cost {1} less to cast.
Whenever another creature you control with flying enters, Watcher of the Spheres gets +1/+1 until end of turn.

Migratory Route

Create four 1/1 white Bird creature tokens with flying.
Basic landcycling {2} ({2}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)

Island

Displace

Exile up to two target creatures you control, then return those cards to the battlefield under their owner's control.