Celestial Enforcer

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

Falconer Adept

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

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

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.

Enchant creature
Enchanted creature has defender and loses flying.

Target creature gets +2/+2 until end of turn. You gain 1 life for each attacking creature you control.

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

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

Flash
Flying
When Angel of the Dire Hour enters, if you cast it from your hand, exile all attacking creatures.

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