Vampire Interloper

Blood Seeker

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

Sign in Blood

Target player draws two cards and loses 2 life.

Dash Hopes

When you cast this spell, any player may pay 5 life. If a player does, counter Dash Hopes.
Counter target spell.

Swamp

Child of Night

Bloodthrone Vampire

Sacrifice a creature: This creature gets +2/+2 until end of turn.

Doom Blade

Markov Patrician

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

Guul Draz Vampire

As long as an opponent has 10 or less life, this creature gets +2/+1 and has intimidate. (It can't be blocked except by artifact creatures and/or creatures that share a color with it.)

Pulse Tracker

Whenever this creature attacks, each opponent loses 1 life.

Unholy Strength

Enchant creature
Enchanted creature gets +2/+1.

Stromkirk Patrol

Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.

Crippling Blight

Enchant creature
Enchanted creature gets -1/-1 and can't block.

Vampire's Bite

Kicker {2}{B} (You may pay an additional {2}{B} as you cast this spell.)
Target creature gets +3/+0 until end of turn. If this spell was kicked, that creature gains lifelink until end of turn. (Damage dealt by the creature also causes its controller to gain that much life.)

Dark Ritual

Vampire Lacerator

At the beginning of your upkeep, you lose 1 life unless an opponent has 10 or less life.