Quag Sickness

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

Howling Banshee

Flying
When this creature enters, each player loses 3 life.

Diabolic Tutor

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

Royal Assassin

Giant Growth

Target creature gets +3/+3 until end of turn.

Sorcerer's Strongbox

{2}, {T}: Flip a coin. If you win the flip, sacrifice this artifact and draw three cards.

Cultivate

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

Nature's Spiral

Return target permanent card from your graveyard to your hand.

Spined Wurm

Viscera Seer

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

Reassembling Skeleton

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

Forest

Doom Blade

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.

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.

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.

Barony Vampire

Swamp

Naturalize

Child of Night

Bloodthrone Vampire

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

Giant Spider

Reach (This creature can block creatures with flying.)