Falconer Adept

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

Thriving Heath

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

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

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

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

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

Exile target creature or planeswalker. Its controller creates a 4/4 white Angel creature token with flying.

Enchant creature
Enchanted creature has defender and loses flying.

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

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