Rewards of Diversity

Whenever an opponent casts a multicolored spell, you gain 4 life.

Storm Herd

Create X 1/1 white Pegasus creature tokens with flying, where X is your life total.

Reconnaissance

{0}: Remove target attacking creature you control from combat and untap it. (If you activate during end of combat, the creature will untap after it deals combat damage.)

Orim's Prayer

Whenever one or more creatures attack you, you gain 1 life for each attacking creature.

Auriok Champion

Protection from black and from red
Whenever another creature enters, you may gain 1 life.

Authority of the Consuls

Creatures your opponents control enter tapped.
Whenever a creature an opponent controls enters, you gain 1 life.

The Gaffer

At the beginning of each end step, if you gained 3 or more life this turn, draw a card.

Soul's Attendant

Whenever another creature enters, you may gain 1 life.

Heliod, Sun-Crowned

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.

Righteous Cause

Whenever a creature attacks, you gain 1 life.

Sunscorch Regent

Flying
Whenever an opponent casts a spell, put a +1/+1 counter on this creature and you gain 1 life.