Pacifism

Enchant creature
Enchanted creature can't attack or block.

Infantry Veteran

{T}: Target attacking creature gets +1/+1 until end of turn.

Vigilance (Attacking doesn't cause this creature to tap.)

Destroy target attacking creature. You gain life equal to its power.

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

Flying, vigilance (This creature can't be blocked except by creatures with flying or reach, and attacking doesn't cause this creature to tap.)

Whenever a player casts a white spell, you may gain 1 life.

{T}: Crossbow Infantry deals 1 damage to target attacking or blocking creature.

{X}{W}, {T}: Ballista Squad deals X damage to target attacking or blocking creature.

Prevent the next 4 damage that would be dealt to any target this turn.

When Venerable Monk enters, you gain 2 life.

Flying
When Angel of Mercy enters, you gain 3 life.