Faith's Fetters

Enchant permanent
When Faith's Fetters enters, you gain 4 life.
Enchanted permanent can't attack or block, and its activated abilities can't be activated unless they're mana abilities.

Kabira Crossroads

Kabira Crossroads enters tapped.
When Kabira Crossroads enters, you gain 2 life.
{T}: Add {W}.

Mesa Unicorn

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

Qala, Ajani's Pridemate

Whenever Qala, Ajani's Pridemate attacks, other attacking creatures you control get +X/+0 until end of turn, where X is the number of counters on Qala.
Whenever you gain life, put a +1/+1 counter on Qala.
{3}{W}: You gain 1 life.

Thriving Heath

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

Angel of Vitality

Flying
If you would gain life, you gain that much life plus 1 instead.
This creature gets +2/+2 as long as you have 25 or more life.

Hinterland Sanctifier

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

Divine Arrow

Divine Arrow deals 4 damage to target attacking or blocking creature.

Speaker of the Heavens

Vigilance, lifelink (Attacking doesn't cause this creature to tap. Damage dealt by this creature also causes you to gain that much life.)
{T}: Create a 4/4 white Angel creature token with flying. Activate only if you have at least 7 life more than your starting life total and only as a sorcery.

Brightmare

When Brightmare enters, tap up to one target creature. You gain life equal to that creature's power.

Revitalize

Desperate Lunge

Target creature gets +2/+2 and gains flying until end of turn. You gain 2 life.

Plains

Angel of Mercy

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

Ajani's Pridemate

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