Celestial Unicorn

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

Omen of the Sun

Flash
When this enchantment enters, create two 1/1 white Human Soldier creature tokens and you gain 2 life.
{2}{W}, Sacrifice this enchantment: Scry 2.

Gift of Fangs

Enchant creature
Enchanted creature gets +2/+2 as long as it's a Vampire. Otherwise, it gets -2/-2.

Plains

Scoured Barrens

This land enters tapped.
When this land enters, you gain 1 life.
{T}: Add {W} or {B}.

God-Pharaoh's Faithful

Whenever you cast a blue, black, or red spell, you gain 1 life.

Desperate Bloodseeker

Lifelink
When this creature enters, target player mills two cards. (They put the top two cards of their library into their graveyard.)

Call to the Feast

Create three 1/1 white Vampire creature tokens with lifelink.

Creeping Bloodsucker

At the beginning of your upkeep, this creature deals 1 damage to each opponent. You gain life equal to the damage dealt this way.

Obscura Storefront

When this land enters, sacrifice it. When you do, search your library for a basic Plains, Island, or Swamp card, put it onto the battlefield tapped, then shuffle and you gain 1 life.

Soul Warden

Whenever another creature enters, you gain 1 life.

Reckoner's Bargain

As an additional cost to cast this spell, sacrifice an artifact or creature.
You gain life equal to the sacrificed permanent's mana value. Draw two cards.

Marauding Blight-Priest

Whenever you gain life, each opponent loses 1 life.

Reaping the Rewards

Buyback—Sacrifice a land. (You may sacrifice a land in addition to any other costs as you cast this spell. If you do, put this card into your hand as it resolves.)
You gain 2 life.

Swamp

Vampire Neonate

{2}, {T}: Each opponent loses 1 life and you gain 1 life.

Recumbent Bliss

Enchant creature
Enchanted creature can't attack or block.
At the beginning of your upkeep, you may gain 1 life.