Aven Gagglemaster

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

Celestial Enforcer

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

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

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

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

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

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

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

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.)

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

Enchant creature
Enchanted creature has defender and loses flying.

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