Warded Battlements

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

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.

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

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

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

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

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

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

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.

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

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.)

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

Up to two target creatures each get +1/+2 until end of turn. You gain 2 life.

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.)

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

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