Creeping Bloodsucker

At the beginning of your upkeep, Creeping Bloodsucker deals 1 damage to each opponent. You gain life equal to the damage dealt this way.

Murder

Sorin's Thirst

Sorin's Thirst deals 2 damage to target creature and you gain 2 life.

Gift of Fangs

Enchant creature
Enchanted creature gets +2/+2 as long as it's a Vampire. Otherwise, it gets -2/-2.

Daggerdrome Imp

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

Squelching Leeches

Squelching Leeches's power and toughness are each equal to the number of Swamps you control.

Liliana's Caress

Whenever an opponent discards a card, that player loses 2 life.

Swamp

Plains

Blood Burglar

During your turn, Blood Burglar has lifelink.(Damage dealt by this creature also causes you to gain that much life.)

Grasp of Darkness

Target creature gets -4/-4 until end of turn.

Blood Baron of Vizkopa

Lifelink, protection from white and from black
As long as you have 30 or more life and an opponent has 10 or less life, Blood Baron of Vizkopa gets +6/+6 and has flying.

Bloodbond Vampire

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

Alaborn Musketeer

Reach (This creature can block creatures with flying.)

Murderer's Axe

Equipped creature gets +2/+2.
Equip—Discard a card.

Exotic Disease

Domain — Target player loses X life and you gain X life, where X is the number of basic land types among lands you control.

Liliana's Elite

Liliana's Elite gets +1/+1 for each creature card in your graveyard.

Stalking Bloodsucker

Flying
{1}{B}, Discard a card: Stalking Bloodsucker gets +2/+2 until end of turn.