Disease Carriers

When this creature dies, target creature gets -2/-2 until end of turn.

Dying Wail

Enchant creature
When enchanted creature dies, target player discards two cards.

Encroach

Target player reveals their hand. You choose a nonbasic land card from it. That player discards that card.

False Prophet

When this creature dies, exile all creatures.

Eradicate

Exile target nonblack creature. Search its controller's graveyard, hand, and library for all cards with the same name as that creature and exile them. Then that player shuffles.

Festering Wound

Enchant creature
At the beginning of your upkeep, you may put an infection counter on this Aura.
At the beginning of the upkeep of enchanted creature's controller, this Aura deals X damage to that player, where X is the number of infection counters on this Aura.

Lurking Jackals

When an opponent has 10 or less life, if this permanent is an enchantment, it becomes a 3/2 Jackal creature.

Nightshade Seer

{2}{B}, {T}: Reveal any number of black cards in your hand. Target creature gets -X/-X until end of turn, where X is the number of cards revealed this way.

Phyrexian Monitor

Phyrexian Negator

Trample
Whenever this creature is dealt damage, sacrifice that many permanents.

Plague Dogs

When this creature dies, all creatures get -1/-1 until end of turn.
{2}, Sacrifice this creature: Draw a card.

Rapid Decay

Exile up to three target cards from a single graveyard.
Cycling {2} ({2}, Discard this card: Draw a card.)

Ravenous Rats

When this creature enters, target opponent discards a card.

Scent of Nightshade

Reveal any number of black cards in your hand. Target creature gets -X/-X until end of turn, where X is the number of cards revealed this way.

Fend Off

Prevent all combat damage that would be dealt by target creature this turn.
Cycling {2} ({2}, Discard this card: Draw a card.)

Skittering Horror

When you cast a creature spell, sacrifice this creature.

Urza's Destiny