Whenever you cast a spell, you gain 1 life for each spell you've cast this turn.

Pay 50 life: Aetherflux Reservoir deals 50 damage to any target.

Double target player's life total. Shuffle Beacon of Immortality into its owner's library.

If you would gain life, you gain that much life plus 1 instead.

{2}{W}{B}{G}, {T}, Exile Bilbo, Birthday Celebrant: Search your library for any number of creature cards, put them onto the battlefield, then shuffle. Activate only if you have 111 or more life.

(Gain the next level as a sorcery to add its ability.)

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.

Deathtouch

Whenever another creature enters the battlefield under your control, you gain 1 life.

Whenever another creature you control dies, each opponent loses 1 life.

Whenever another creature enters the battlefield, you gain 1 life.

Lifelink

At the beginning of each end step, if you gained life this turn, distribute up to that many +1/+1 counters among any number of other target creatures.

When Prosperous Innkeeper enters, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

Whenever another creature you control enters, you gain 1 life.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

If you would gain life, you gain twice that much life instead.

Whenever another creature enters the battlefield, you gain 1 life.

Whenever another creature enters the battlefield, you may gain 1 life.

Whenever another creature you control enters, you may gain 1 life.

Whenever a creature an opponent controls enters, you may have that player lose 1 life.

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

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

{3}{B}{B}: Creatures you control gain lifelink until end of turn.

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