Take Heart

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

Plains

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

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

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

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

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

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.

Flying
Whenever Steel-Plume Marshal attacks, other attacking creatures you control with flying 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.

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.

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

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

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

Flying
When Archon of Justice dies, exile target permanent.

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