Relentless Rats

Relentless Rats gets +1/+1 for each other creature on the battlefield named Relentless Rats.
A deck can have any number of cards named Relentless Rats.

Soul Bleed

Enchant creature
At the beginning of the upkeep of enchanted creature's controller, that player loses 1 life.

Sanguine Bond

Whenever you gain life, target opponent loses that much life.

Haunting Echoes

Exile all cards from target player's graveyard other than basic land cards. For each card exiled this way, search that player's library for all cards with the same name as that card and exile them. Then that player shuffles.

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.

Liliana Vess

+1: Target player discards a card.
−2: Search your library for a card, then shuffle and put that card on top.
−8: Put all creature cards from all graveyards onto the battlefield under your control.

Kelinore Bat

Demon's Horn

Whenever a player casts a black spell, you may gain 1 life.

Gargoyle Castle

{T}: Add {C}.
{5}, {T}, Sacrifice Gargoyle Castle: Create a 3/4 colorless Gargoyle artifact creature token with flying.

Doom Blade

Dread Warlock

Dread Warlock can't be blocked except by black creatures.

Underworld Dreams

Whenever an opponent draws a card, Underworld Dreams deals 1 damage to that player.

Mind Rot

Platinum Angel

Flying
You can't lose the game and your opponents can't win the game.

Mind Shatter

Target player discards X cards at random.

Howling Mine

At the beginning of each player's draw step, if Howling Mine is untapped, that player draws an additional card.

Sign in Blood

Target player draws two cards and loses 2 life.

Swamp

Child of Night

Royal Assassin

Megrim

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

Disentomb

Return target creature card from your graveyard to your hand.

Tendrils of Corruption

Tendrils of Corruption deals X damage to target creature and you gain X life, where X is the number of Swamps you control.

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