
Jorubai Murk Lurker | Creature | Leech | Jorubai Murk Lurker gets +1/+1 as long as you control a Swamp.
{1}{B}: Target creature gains lifelink until end of turn. (Damage dealt by the creature also causes its controller to gain that much life.) | Clint Cearley

Carrion Crow | Creature | Zombie Bird | Flying (This creature can't be blocked except by creatures with flying or reach.)
Carrion Crow enters the battlefield tapped. | Aaron Miller

Feast on the Fallen | Enchantment | | At the beginning of each upkeep, if an opponent lost life last turn, put a +1/+1 counter on target creature you control. | Dave Kendall

Festergloom | Sorcery | | Nonblack creatures get -1/-1 until end of turn. | Mathias Kollros

Mind Rot | Sorcery | | Target player discards two cards. | Steve Luke

Necrobite | Instant | | Target creature gains deathtouch until end of turn. Regenerate it. (The next time that creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat. Any amount of damage a creature with deathtouch deals to a creature is enough to destroy it.) | Nils Hamm

Necrogen Scudder | Creature | Phyrexian Horror | Flying
When Necrogen Scudder enters the battlefield, you lose 3 life. | Raymond Swanland

Necromancer's Assistant | Creature | Zombie | When Necromancer's Assistant enters the battlefield, mill three cards. | Svetlin Velinov

Stab Wound | Enchantment | Aura | Enchant creature
Enchanted creature gets -2/-2.
At the beginning of the upkeep of enchanted creature's controller, that player loses 2 life. | Scott Chou

Wall of Limbs | Creature | Zombie Wall | Defender (This creature can't attack.)
Whenever you gain life, put a +1/+1 counter on Wall of Limbs.
{5}{B}{B}, Sacrifice Wall of Limbs: Target player loses X life, where X is Wall of Limbs's power. | Yeong-Hao Han

Witch's Familiar | Creature | Frog | | Jack Wang

Xathrid Slyblade | Creature | Human Assassin | Hexproof (This creature can't be the target of spells or abilities your opponents control.)
{3}{B}: Until end of turn, Xathrid Slyblade loses hexproof and gains first strike and deathtouch. (It deals combat damage before creatures without first strike. Any amount of damage it deals to a creature is enough to destroy it.) | Steve Prescott