Ancestor Dragon

Flying
Whenever one or more creatures you control attack, you gain 1 life for each attacking creature.

Bishop's Soldier

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

Quick-Draw Katana

During your turn, equipped creature gets +2/+0 and has first strike. (It deals combat damage before creatures without first strike.)
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

Herald of Faith

Flying
Whenever this creature attacks, you gain 2 life.

Hinterland Sanctifier

Whenever another creature you control enters, you gain 1 life.

Inspiring Overseer

Flying
When this creature enters, you gain 1 life and draw a card.

Deadly Riposte

Deadly Riposte deals 3 damage to target tapped creature and you gain 2 life.

Adamant Will

Target creature gets +2/+2 and gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Dazzling Angel

Flying
Whenever another creature you control enters, you gain 1 life.

Prayer of Binding

Flash
When this enchantment enters, exile up to one target nonland permanent an opponent controls until this enchantment leaves the battlefield. You gain 2 life.

Uncharted Haven

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

Ajani's Pridemate

Whenever you gain life, put a +1/+1 counter on this creature.

Plains

Twinblade Paladin

Whenever you gain life, put a +1/+1 counter on this creature.
As long as you have 25 or more life, this creature has double strike. (It deals both first-strike and regular combat damage.)