Certain Death

Destroy target creature. Its controller loses 2 life and you gain 2 life.

Tattered Mummy

When Tattered Mummy dies, each opponent loses 2 life.

Sengir Vampire

Flying (This creature can't be blocked except by creatures with flying or reach.)
Whenever a creature dealt damage by Sengir Vampire this turn dies, put a +1/+1 counter on Sengir Vampire.

Nightmare

Flying (This creature can't be blocked except by creatures with flying or reach.)
Nightmare's power and toughness are each equal to the number of Swamps you control.

Gravedigger

When Gravedigger enters, you may return target creature card from your graveyard to your hand.

Swamp

Untamed Hunger

Enchant creature
Enchanted creature gets +2/+1 and has menace. (It can't be blocked except by two or more creatures.)

Bloodhunter Bat

Flying
When Bloodhunter Bat enters, target player loses 2 life and you gain 2 life.

Raise Dead

Return target creature card from your graveyard to your hand.

Essence Extraction

Essence Extraction deals 3 damage to target creature and you gain 3 life.