Royal Assassin

Blood Tithe

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

Assassinate

Relentless Rats

Relentless Rats gets +1/+1 for each other creature on the battlefield named Relentless Rats.
A deck can have any number of cards named Relentless Rats.

Captivating Vampire

Other Vampire creatures you control get +1/+1.
Tap five untapped Vampires you control: Gain control of target creature. It becomes a Vampire in addition to its other types.

Howling Banshee

Flying
When Howling Banshee enters, each player loses 3 life.

Doom Blade

Bog Raiders

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Bloodthrone Vampire

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

Reassembling Skeleton

{1}{B}: Return this card from your graveyard to the battlefield tapped.

Diabolic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Mind Rot

Quag Sickness

Enchant creature
Enchanted creature gets -1/-1 for each Swamp you control.

Barony Vampire

Sign in Blood

Target player draws two cards and loses 2 life.

Nether Horror

Viscera Seer

Sacrifice a creature: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Child of Night

Corrupt

Corrupt deals damage to any target equal to the number of Swamps you control. You gain life equal to the damage dealt this way.

Stabbing Pain

Target creature gets -1/-1 until end of turn. Tap that creature.

Rise from the Grave

Put target creature card from a graveyard onto the battlefield under your control. That creature is a black Zombie in addition to its other colors and types.

Nightwing Shade

Flying
{1}{B}: Nightwing Shade gets +1/+1 until end of turn.

Deathmark

Duress

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.