Zephid

Flying
Shroud (This creature can't be the target of spells or abilities.)

Zephid's Embrace

Enchant creature
Enchanted creature gets +2/+2 and has flying and shroud. (It can't be the target of spells or abilities.)

Abyssal Horror

Flying
When this creature enters, target player discards two cards.

Befoul

Destroy target land or nonblack creature. It can't be regenerated.

Bereavement

Whenever a green creature dies, its controller discards a card.

Blood Vassal

Bog Raiders

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Disenchant

Breach

Target creature gets +2/+0 and gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)

Cackling Fiend

When this creature enters, each opponent discards a card.

Carrion Beetles

{2}{B}, {T}: Exile up to three target cards from a single graveyard.

Contamination

At the beginning of your upkeep, sacrifice this enchantment unless you sacrifice a creature.
If a land is tapped for mana, it produces {B} instead of any other type and amount.

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.

Crazed Skirge

Dark Hatchling

Flying
When this creature enters, destroy target nonblack creature. It can't be regenerated.

Urza's Saga