Swamp

Epicure of Blood

Whenever you gain life, each opponent loses 1 life.

Sanctum Seeker

Whenever a Vampire you control attacks, each opponent loses 1 life and you gain 1 life.

Savage Gorger

Flying
At the beginning of your end step, if an opponent lost life this turn, put a +1/+1 counter on Savage Gorger. (Damage causes loss of life.)

Murder

Sorin's Thirst

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

Vampire of the Dire Moon

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Sorin's Guide

When Sorin's Guide enters the battlefield, you may search your library and/or graveyard for a card named Sorin, Vampire Lord, reveal it, and put it into your hand. If you search your library this way, shuffle.

Gravewaker

Flying (This creature can't be blocked except by creatures with flying or reach.)
{5}{B}{B}: Return target creature card from your graveyard to the battlefield tapped.

Sorin, Vampire Lord

+1: Up to one target creature gets +2/+0 until end of turn.
−2: Sorin, Vampire Lord deals 4 damage to any target. You gain 4 life.
−8: Until end of turn, each Vampire you control gains "{T}: Gain control of target creature."

Vampire Neonate

{2}, {T}: Each opponent loses 1 life and you gain 1 life.

Blood Burglar

As long as it's your turn, Blood Burglar has lifelink. (Damage dealt by this creature also causes you to gain that much life.)

Cast Down

Vampire Opportunist

{6}{B}: Each opponent loses 2 life and you gain 2 life.

Thirsting Bloodlord

Bloodthirsty Aerialist

Flying
Whenever you gain life, put a +1/+1 counter on Bloodthirsty Aerialist.

Dark Remedy

Target creature gets +1/+3 until end of turn.

Dread Presence

Whenever a Swamp enters the battlefield under your control, choose one —
• You draw a card and you lose 1 life.
• Dread Presence deals 2 damage to any target and you gain 2 life.