Marauding Blight-Priest

Whenever you gain life, each opponent loses 1 life.

Soul Warden

Whenever another creature enters, you gain 1 life.

Scoured Barrens

Scoured Barrens enters tapped.
When Scoured Barrens enters, you gain 1 life.
{T}: Add {W} or {B}.

Celestial Unicorn

Whenever you gain life, put a +1/+1 counter on Celestial Unicorn.

Dogged Pursuit

At the beginning of your end step, each opponent loses 1 life and you gain 1 life.

Soul's Attendant

Whenever another creature enters, you may gain 1 life.

Impassioned Orator

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

Mystical Tether

You may cast Mystical Tether as though it had flash if you pay {2} more to cast it.
When Mystical Tether enters, exile target artifact or creature an opponent controls until Mystical Tether leaves the battlefield.

Eriette's Lullaby

Destroy target tapped creature. You gain 2 life.

Epicure of Blood

Suture Priest

Whenever another creature you control enters, you may gain 1 life.
Whenever a creature an opponent controls enters, you may have that player lose 1 life.

Lifelink

Enchant creature
Enchanted creature has lifelink. (Damage dealt by the creature also causes its controller to gain that much life.)

Radiant Fountain

When Radiant Fountain enters, you gain 2 life.
{T}: Add {C}.

Swamp

Trespasser's Curse

Enchant player
Whenever a creature enchanted player controls enters, that player loses 1 life and you gain 1 life.