Pitiless Gorgon

Desecrator Hag

When this creature enters, return to your hand the creature card in your graveyard with the greatest power. If two or more cards are tied for greatest power, you choose one of them.

Drain the Well

Llanowar Dead

Infuse with Vitality

Until end of turn, target creature gains deathtouch and "When this creature dies, return it to the battlefield tapped under its owner's control."
You gain 2 life.

Brindle Boar

Sacrifice this creature: You gain 4 life.

Breathe Your Last

Destroy target creature or planeswalker. You gain 1 life for each of its colors.

Canker Abomination

As this creature enters, choose an opponent. This creature enters with a -1/-1 counter on it for each creature that player controls.

Deathless Knight

Haste
When you gain life for the first time each turn, return this card from your graveyard to your hand.

Butcher's Glee

Target creature gets +3/+0 and gains lifelink until end of turn. Regenerate it. (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)

Slitherhead

Scavenge {0} ({0}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

Appetite for the Unnatural

Destroy target artifact or enchantment. You gain 2 life.

Cram Session

You gain 4 life.
Learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)

Blood Researcher

Menace (This creature can't be blocked except by two or more creatures.)
Whenever you gain life, put a +1/+1 counter on this creature.

Agate-Blade Assassin

Whenever this creature attacks, defending player loses 1 life and you gain 1 life.

Putrid Leech

Pay 2 life: This creature gets +2/+2 until end of turn. Activate only once each turn.

Acolyte of Aclazotz

{T}, Sacrifice another creature or artifact: Each opponent loses 1 life and you gain 1 life.

Bloodrite Invoker

{8}: Target player loses 3 life and you gain 3 life.

Grim Contest

Choose target creature you control and target creature an opponent controls. Each of those creatures deals damage equal to its toughness to the other.

Aerial Predation

Destroy target creature with flying. You gain 2 life.

Dawnhart Rejuvenator

When this creature enters, you gain 3 life.
{T}: Add one mana of any color.

Gift of the Deity

Enchant creature
As long as enchanted creature is black, it gets +1/+1 and has deathtouch. (Any amount of damage it deals to a creature is enough to destroy that creature.)
As long as enchanted creature is green, it gets +1/+1 and all creatures able to block it do so.

Blood Tithe

Each opponent loses 3 life. You gain life equal to the life lost this way.

Duskwielder

Boast — {1}: Target opponent loses 1 life and you gain 1 life. (Activate only if this creature attacked this turn and only once each turn.)

Essence Warden

Whenever another creature enters, you gain 1 life.

Bottle Gnomes

Sacrifice this creature: You gain 3 life.

Pest Summoning

Create two 1/1 black and green Pest creature tokens with "When this token dies, you gain 1 life."

Woodlurker Mimic

Whenever you cast a spell that's both black and green, this creature has base power and toughness 4/5 until end of turn and gains wither until end of turn. (It deals damage to creatures in the form of -1/-1 counters.)