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