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.

Rhox Pikemaster

First strike (This creature deals combat damage before creatures without first strike.)
Other Soldier creatures you control have first strike.

Disentomb

Return target creature card from your graveyard to your hand.

Sign in Blood

Target player draws two cards and loses 2 life.

Acolyte of Xathrid

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.

Coral Merfolk

Prevent all combat damage that would be dealt this turn.

Howling Banshee

Flying
When Howling Banshee enters, each player loses 3 life.

Blinding Mage

Consume Spirit

Spend only black mana on X.
Consume Spirit deals X damage to any target and you gain X life.

Burst of Speed

Creatures you control gain haste until end of turn. (They can attack and {T} even if they just came under your control.)

Plains

Looming Shade

{B}: Looming Shade gets +1/+1 until end of turn.

Sparkmage Apprentice

When Sparkmage Apprentice enters, it deals 1 damage to any target.

Lava Axe

Lava Axe deals 5 damage to target player or planeswalker.

Zombie Goliath

Raging Goblin

Haste (This creature can attack and {T} as soon as it comes under your control.)

Soul Warden

Whenever another creature enters, you gain 1 life.

Warpath Ghoul

Merfolk Looter

Swamp

Divination

Solemn Offering

Destroy target artifact or enchantment. You gain 4 life.

Ponder

Look at the top three cards of your library, then put them back in any order. You may shuffle.
Draw a card.

Assassinate

Dread Warlock

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

Mind Rot

Pyroclasm

Pyroclasm deals 2 damage to each creature.

Unholy Strength

Enchant creature
Enchanted creature gets +2/+1.

Firebreathing

Enchant creature
{R}: Enchanted creature gets +1/+0 until end of turn.

Righteousness

Target blocking creature gets +7/+7 until end of turn.

Air Elemental

Xathrid Demon

Flying, trample
At the beginning of your upkeep, sacrifice a creature other than Xathrid Demon, then each opponent loses life equal to the sacrificed creature's power. If you can't sacrifice a creature, tap Xathrid Demon and you lose 7 life.

Windstorm

Windstorm deals X damage to each creature with flying.

Lifelink

Enchant creature
Enchanted creature has lifelink. (Damage dealt by the creature also causes its controller to gain that much life.)