Plains

Celestial Enforcer

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

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

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

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

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

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

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

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

Flying
When this creature 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 and gains lifelink until end of turn. (Damage dealt by the creature also causes its controller to gain that much life.)

Flying
Whenever this creature attacks, other attacking creatures you control with flying get +2/+2 until end of turn.