Healer's Hawk

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

Plains

Enchant creature
Enchanted creature has defender and loses flying.

Flying
When Aven Gagglemaster enters, you gain 2 life for each creature you control with flying.

Flying
Whenever Steel-Plume Marshal attacks, other attacking creatures you control with flying get +2/+2 until end of turn.

Up to two target creatures each get +2/+2 until end of turn.

Whenever Falconer Adept attacks, create a 1/1 white Bird creature token with flying that's tapped and attacking.

Flying
Whenever a creature with flying dies, put a +1/+1 counter on Soulcatcher.

When Seller of Songbirds enters, create a 1/1 white Bird creature token with flying.

Thriving Heath enters tapped. As it enters, choose a color other than white.
{T}: Add {W} or one mana of the chosen color.

Target creature gets +2/+2 and gains lifelink until end of turn. (Damage dealt by the creature also causes its controller to gain that much life.)

Flying
When Gale Swooper enters, target creature gains flying until end of turn.

Flying
Whenever Archon of Redemption or another creature you control with flying enters, you may gain life equal to that creature's power.

Flying
When Archon of Justice dies, exile target permanent.

Defender (This creature can't attack.)
Attacking creatures you control get +1/+0.

Destroy target tapped creature. You gain 1 life for each creature you control with flying.

Target creature gets +1/+7 until end of turn.

Untap all creatures you control. Creatures you control with flying get +2/+2 until end of turn.

{1}{W}, {T}: Tap target creature. Activate only if you control a creature with flying.