Blood Tithe

Each opponent loses 3 life. You gain life equal to the life lost this way.

Scion of the Swarm

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

Titan Hunter

At the beginning of each player's end step, if no creatures died this turn, this creature deals 4 damage to that player.
{1}{B}, Sacrifice a creature: You gain 4 life.

Springsage Ritual

Destroy target artifact or enchantment. You gain 4 life.

Bloodthirsty Aerialist

Bloodbond Vampire

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

Epicure of Blood

Whenever you gain life, each opponent loses 1 life.

Ill-Gotten Inheritance

At the beginning of your upkeep, this enchantment deals 1 damage to each opponent and you gain 1 life.
{5}{B}, Sacrifice this enchantment: It deals 4 damage to target opponent and you gain 4 life.

Dina, Soul Steeper

Whenever you gain life, each opponent loses 1 life.
{1}, Sacrifice another creature: Dina gets +X/+0 until end of turn, where X is the sacrificed creature's power.

Bottle Golems

Trample
When this creature dies, you gain life equal to its power.

Life Goes On

You gain 4 life. If a creature died this turn, you gain 8 life instead.

Blood Researcher

Menace (This creature can't be blocked except by two or more creatures.)
Whenever you gain life, put a +1/+1 counter on this creature.

Wall of Limbs

Defender (This creature can't attack.)
Whenever you gain life, put a +1/+1 counter on this creature.
{5}{B}{B}, Sacrifice this creature: Target player loses X life, where X is this creature's power.

Blossoming Wreath

You gain life equal to the number of creature cards in your graveyard.

Marauding Blight-Priest

Vito, Thorn of the Dusk Rose

Whenever you gain life, target opponent loses that much life.
{3}{B}{B}: Creatures you control gain lifelink until end of turn.

Alhammarret's Archive

If you would gain life, you gain twice that much life instead.
If you would draw a card except the first one you draw in each of your draw steps, draw two cards instead.