Target creature gains deathtouch until end of turn. Regenerate it. (The next time that creature would be destroyed this turn, it isnt. 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.)

Flying

When Necrogen Scudder enters the battlefield, you lose 3 life.

When Necromancers Assistant enters the battlefield, put the top three cards of your library into your graveyard.

1B, Discard a creature card: Draw a card. If the discarded card was a Zombie card, put a 2/2 black Zombie creature token onto the battlefield tapped.

Nightfire Giant gets +1/+1 as long as you control a Mountain.

4R: Nightfire Giant deals 2 damage to target creature or player.

Flying

Nightmares power and toughness are each equal to the number of Swamps you control.

Flying, trample

Whenever an opponent searches his or her library, that player sacrifices a creature and loses 10 life.

Whenever another creature dies, put a +1/+1 counter on Ob Nixilis, Unshackled.

Other black creatures you control get +1/+1.

2B, TAP: Another target black creature you control gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)

When Rotfeaster Maggot enters the battlefield, exile target creature card from a graveyard. You gain life equal to that cards toughness.

Flying

Whenever a creature dealt damage by Sengir Vampire this turn dies, put a +1/+1 counter on Sengir Vampire.