Choice of Damnations

Target opponent chooses a number. You may have that player lose that much life. If you don't, that player sacrifices all but that many permanents of their choice.

Earsplitting Rats

When Earsplitting Rats enters, each player discards a card.
Discard a card: Regenerate Earsplitting Rats.

Child of Night

Sorin's Thirst

Sorin's Thirst deals 2 damage to target creature and you gain 2 life.

Unholy Strength

Enchant creature
Enchanted creature gets +2/+1.

Bad Moon

Sewer Rats

{B}, Pay 1 life: Sewer Rats gets +1/+0 until end of turn. Activate no more than three times each turn.

Fallen Angel

Flying
Sacrifice a creature: Fallen Angel gets +2/+1 until end of turn.

Twilight's Call

You may cast Twilight's Call as though it had flash if you pay {2} more to cast it. (You may cast it any time you could cast an instant.)
Each player returns all creature cards from their graveyard to the battlefield.

Carrion Rats

Whenever Carrion Rats attacks or blocks, any player may exile a card from their graveyard. If a player does, Carrion Rats assigns no combat damage this turn.

Abyssal Specter

Flying
Whenever Abyssal Specter deals damage to a player, that player discards a card.

Nezumi Cutthroat

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
Nezumi Cutthroat can't block.

Megrim

Whenever an opponent discards a card, Megrim deals 2 damage to that player.

Rabid Rats

{T}: Target blocking creature gets -1/-1 until end of turn.

Midnight Banshee

Wither (This deals damage to creatures in the form of -1/-1 counters.)
At the beginning of your upkeep, put a -1/-1 counter on each nonblack creature.

Black Knight

First strike (This creature deals combat damage before creatures without first strike.)
Protection from white (This creature can't be blocked, targeted, dealt damage, or enchanted by anything white.)

Larceny

Whenever a creature you control deals combat damage to a player, that player discards a card.

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.

Razortooth Rats

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Swamp

Ravenous Rats

When Ravenous Rats enters, target opponent discards a card.

Cursed Ronin

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)
{B}: Cursed Ronin gets +1/+1 until end of turn.