+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.

Ward—Pay 3 life.

Whenever you gain life, Amalia Benavides Aguirre explores. Then destroy all other creatures if its power is exactly 20. (To have this creature explore, reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

Whenever you gain life for the first time each turn, create a 1/1 white Cat creature token.

: Another target Cleric gains lifelink until end of turn.

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

Whenever you gain life, put a +1/+1 counter on Celestial Unicorn.

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.

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

Flying

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

Flying, double strike, lifelink

Whenever you gain life, draw a card.

Whenever you gain life, each opponent loses 1 life.

When Field-Tested Frying Pan enters the battlefield, create a Food token, then create a 1/1 white Halfling creature token and attach Field-Tested Frying Pan to it.

Equipped creature has "Whenever you gain life, this creature gets +X/+X until end of turn, where X is the amount of life you gained."

Equip

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

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

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.

Whenever you gain life, you may pay . If you do, put a +1/+1 counter on each creature you control and those creatures gain trample until end of turn.

Flying, deathtouch

Whenever you gain life, Malakir Familiar gets +1/+1 until end of turn.

Whenever you gain life, Nirkana Assassin gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)

At the beginning of your upkeep, you gain 2 life.

Whenever you gain life, you may pay . If you do, draw a card and each opponent loses 1 life.

At the beginning of your upkeep, if Oloro, Ageless Ascetic is in the command zone, you gain 2 life.

More Than Meets the Eye (You may cast this card converted for .)

Lifelink

Whenever you gain life, you may convert Ratchet. When you do, return target artifact card with mana value less than or equal to the amount of life you gained this turn from your graveyard to the battlefield tapped.

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

Whenever you gain life, you may pay . If you do, Searing Meditation deals 2 damage to any target.

Enchant creature

Enchanted creature has "Whenever you gain life, put that many +1/+1 counters on this creature."

Trample, ward

When Treebeard, Gracious Host enters the battlefield, create two Food tokens.

Whenever you gain life, put that many +1/+1 counters on target Halfling or Treefolk.

Whenever you gain life, you may pay . If you do, create a 4/4 green Fungus Beast creature token with trample.

Flying

Whenever you gain life during your turn, put a +1/+1 counter on Vampire Scrivener.

Whenever you lose life during your turn, put a +1/+1 counter on Vampire Scrivener.

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

: Creatures you control gain lifelink until end of turn.

Whenever you gain life, put a +1/+1 counter on Voice of the Blessed.

As long as Voice of the Blessed has four or more +1/+1 counters on it, it has flying and vigilance.

As long as Voice of the Blessed has ten or more +1/+1 counters on it, it has indestructible.

Whenever you gain life, you may pay , where X is less than or equal to the amount of life you gained. If you do, draw X cards.