Repay in Kind

Each player's life total becomes the lowest life total among all players.

Withering Boon

As an additional cost to cast this spell, pay 3 life.
Counter target creature spell.

Essence Warden

Whenever another creature enters, you gain 1 life.

Eternity Vessel

Eternity Vessel enters with X charge counters on it, where X is your life total.
Landfall — Whenever a land you control enters, you may have your life total become the number of charge counters on Eternity Vessel.

Magus of the Mirror

{T}, Sacrifice Magus of the Mirror: Exchange life totals with target opponent. Activate only during your upkeep.

Tree of Redemption

Defender
{T}: Exchange your life total with Tree of Redemption's toughness.

Fortifying Draught

You gain 2 life. Target creature gets +X/+X until end of turn, where X is the amount of life you gained this turn.

Fruit of the First Tree

Enchant creature
When enchanted creature dies, you gain X life and draw X cards, where X is its toughness.

Cadaverous Bloom

Exile a card from your hand: Add {B}{B} or {G}{G}.

Essence Harvest

Target player loses X life and you gain X life, where X is the greatest power among creatures you control.

Blood Celebrant

{B}, Pay 1 life: Add one mana of any color.

Phyrexian Processor

As Phyrexian Processor enters, pay any amount of life.
{4}, {T}: Create an X/X black Phyrexian Minion creature token, where X is the life paid as Phyrexian Processor entered.

Crypt Incursion

Exile all creature cards from target player's graveyard. You gain 3 life for each card exiled this way.

Exsanguinate

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

Consuming Vapors

Target player sacrifices a creature. You gain life equal to that creature's toughness.
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.)

Hatred

As an additional cost to cast this spell, pay X life.
Target creature gets +X/+0 until end of turn.

Deathgreeter

Whenever another creature dies, you may gain 1 life.

Wall of Blood

Defender (This creature can't attack.)
Pay 1 life: Wall of Blood gets +1/+1 until end of turn.

Tavern Swindler

{T}, Pay 3 life: Flip a coin. If you win the flip, you gain 6 life.

Soul Channeling

Enchant creature
Pay 2 life: Regenerate enchanted creature.

Tendrils of Agony

Target player loses 2 life and you gain 2 life.
Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)

Souldrinker

Pay 3 life: Put a +1/+1 counter on Souldrinker.

Font of Agonies

Whenever you pay life, put that many blood counters on Font of Agonies.
{1}{B}, Remove four blood counters from Font of Agonies: Destroy target creature.

Death Frenzy

All creatures get -2/-2 until end of turn. Whenever a creature dies this turn, you gain 1 life.