Luminous Phantom

Flying
Whenever another creature you control leaves the battlefield, you gain 1 life.
If Luminous Phantom would be put into a graveyard from anywhere, exile it instead.

Lunarch Veteran

Whenever another creature you control enters, you gain 1 life.
Disturb {1}{W} (You may cast this card from your graveyard transformed for its disturb cost.)

Lunarch Veteran // Luminous Phantom

Survival Cache

You gain 2 life. Then if you have more life than an opponent, draw a card.
Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)

Impassioned Orator

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

Union of the Third Path

Draw a card, then you gain life equal to the number of cards in your hand.

Soul Warden

Whenever another creature enters, you gain 1 life.

Celestial Unicorn

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

Soul's Attendant

Whenever another creature enters, you may gain 1 life.

Lifecreed Duo

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

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.

Hinterland Sanctifier

Plains

Revitalize

Children of Korlis

Sacrifice this creature: You gain life equal to the life you've lost this turn. (Damage causes loss of life.)

Filigree Familiar

When this creature enters, you gain 2 life.
When this creature dies, draw a card.