When you gain life opponent loses life

Ajani, Strength of the Pride {2}{W}{W}

Legendary Planeswalker - Ajani

[+1]: You gain life equal to the number of creatures you control plus the number of planeswalkers you control.
[–2]: Create a 2/2 white Cat Soldier creature token named Ajani's Pridemate with "Whenever you gain life, put a +1/+1 counter on Ajani's Pridemate."
[0]: If you have at least 15 life more than your starting life total, exile Ajani, Strength of the Pride and each artifact and creature your opponents control.

• The List
• Core Set 2020 Promos — 2p 2s
• Core Set 2020

Attended Healer {3}{W}

Creature - Kor Cleric

Whenever you gain life for the first time each turn, create a 1/1 white Cat creature token.
{2}{W}: Another target Cleric gains lifelink until end of turn.

"My cats have taught me more about the sacred than anything in some old ruin."

2/3

• Zendikar Rising

Blood Researcher {1}{B}{G}

Creature - Vampire Druid

Menace
Whenever you gain life, put a +1/+1 counter on Blood Researcher.

"Dean Valentin warns us not to consume the samples for our safety, but I think he's just being greedy."

2/2

• Strixhaven: School of Mages

Bloodbond Vampire {2}{B}{B}

Creature - Vampire Shaman Ally

Whenever you gain life, put a +1/+1 counter on Bloodbond Vampire.

"Let the vampires join us. In this war, we no longer have the luxury of choosing our comrades."
—General Tazri, allied commander

3/3

• Jumpstart
• Explorers of Ixalan
• Battle for Zendikar

Bloodthirsty Aerialist {1}{B}{B}

Creature - Vampire Rogue

Flying
Whenever you gain life, put a +1/+1 counter on Bloodthirsty Aerialist.

A circus acrobat in life, she kills with such fluid grace that even her victims are awed by her performance.

2/3

• Commander 2021
• Core Set 2020

Cleric Class {W}

Enchantment - Class

If you would gain life, you gain that much life plus 1 instead.
{3}{W}: Level 2
Whenever you gain life, put a +1/+1 counter on target creature you control.
{4}{W}: Level 3
When this Class becomes level 3, return target creature card from your graveyard to the battlefield. You gain life equal to that creature's toughness.

• Adventures in the Forgotten Realms

Cleric of Life's Bond {W}{B}

Creature - Vampire Cleric

Whenever another Cleric enters the battlefield under your control, you gain 1 life.
Whenever you gain life for the first time each turn, put a +1/+1 counter on Cleric of Life's Bond.

"No gods. Only each other."

2/2

• Zendikar Rising

Cliffhaven Vampire {2}{W}{B}

Creature - Vampire Warrior Ally

Flying
Whenever you gain life, each opponent loses 1 life.

"My people are no longer slaves to the Eldrazi, beholden to the past. We will determine our own future."

2/4

• Oath of the Gatewatch

Cradle of Vitality {3}{W}

Enchantment

Whenever you gain life, you may pay {1}{W}. If you do, put a +1/+1 counter on target creature for each 1 life you gained.

Naya's trees grow tall and sturdy. Their foliage intertwines to form dewcups, rainwater pools where the elves gather to celebrate life.

• Jumpstart
• Commander 2013
• Shards of Alara

Dawn of Hope {1}{W}

Enchantment

Whenever you gain life, you may pay {2}. If you do, draw a card.
{3}{W}: Create a 1/1 white Soldier creature token with lifelink.

"To wage war, secure peace within yourself."
—Emmara

• Guilds of Ravnica Promos — 8p 8s
• Guilds of Ravnica

Defiant Bloodlord {5}{B}{B}

Creature - Vampire

Flying
Whenever you gain life, target opponent loses that much life.

"Despite their bravado, mortals are fragile. If Zendikar is to endure, its lords must save it."
—Drana, Kalastria bloodchief

4/5

• Commander 2021
• Magic Online Promos
• Battle for Zendikar Promos — 107 107s
• Battle for Zendikar

Dina, Soul Steeper {B}{G}

Legendary Creature - Dryad Druid

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

1/3

• Strixhaven: School of Mages

Drogskol Reaver {5}{W}{U}

Creature - Spirit

Flying, double strike, lifelink
Whenever you gain life, draw a card.

Wracked and warped with anguish, it obsessively seeks out other souls to hoard within its eternal prison.

3/5

• Double Masters 2022 — 205 489
• Dark Ascension

Famished Paladin {1}{W}

Creature - Vampire Knight

Famished Paladin doesn't untap during your untap step.
Whenever you gain life, untap Famished Paladin.

Loyal to his queen, slave to his thirst.

3/3

• Rivals of Ixalan

Gideon's Company {3}{W}

Creature - Human Soldier

Whenever you gain life, put two +1/+1 counters on Gideon's Company.
{3}{W}: Put a loyalty counter on target Gideon planeswalker.

"For the Legion! For Ravnica!"

3/3

• War of the Spark

Hallowed Priest {1}{W}

Creature - Human Cleric

Whenever you gain life, put a +1/+1 counter on Hallowed Priest.

1/1

• Arena Beginner Set

Heliod, Sun-Crowned {2}{W}

Legendary Enchantment Creature - God

Indestructible
As long as your devotion to white is less than five, Heliod isn't a creature.
Whenever you gain life, put a +1/+1 counter on target creature or enchantment you control.
{1}{W}: Another target creature gains lifelink until end of turn.

5/5

• Secret Lair Drop
• Magic Online Promos
• Theros Beyond Death — 18 259
• Theros Beyond Death Promos — 18p 18s

Kalastria Nightwatch {4}{B}

Creature - Vampire Warrior Ally

Whenever you gain life, Kalastria Nightwatch gains flying until end of turn.

"Kalitas may have returned to mindless servitude beneath the Eldrazi, but we say never again."
—Drana, Kalastria bloodchief

4/5

• Jumpstart
• Mystery Booster
• Battle for Zendikar

Karlov of the Ghost Council {W}{B}

Legendary Creature - Spirit Advisor

Whenever you gain life, put two +1/+1 counters on Karlov of the Ghost Council.
{W}{B}, Remove six +1/+1 counters from Karlov of the Ghost Council: Exile target creature.

"Those who say money can't buy happiness clearly don't have enough."

2/2

• Judge Gift Cards 2021
• Legendary Cube Prize Pack
• Commander 2015

Lich's Mastery {3}{B}{B}{B}

Legendary Enchantment

Hexproof
You can't lose the game.
Whenever you gain life, draw that many cards.
Whenever you lose life, for each 1 life you lost, exile a permanent you control or a card from your hand or graveyard.
When Lich's Mastery leaves the battlefield, you lose the game.

• Dominaria Promos
• Dominaria