Whenever this creature or another creature dies, target player loses 1 life and you gain 1 life.

Target opponent loses 1 life for each attacking creature you control. You gain that much life.

Creatures you control get +1/+1 and have flying and indestructible. At the beginning of your upkeep, sacrifice a creature. If you can't, sacrifice this artifact.

Destroy target creature or enchantment an opponent controls. You lose life equal to that permanent's mana value.

Buyback {4} (You may pay an additional {4} as you cast this spell. If you do, put this card into your hand as it resolves.) Create a 1/1 black Rat creature token.

Each player chooses a creature type. Each player returns all creature cards of a type chosen this way from their graveyard to the battlefield.

As this artifact enters, choose a color. Creatures you control of the chosen color get +1/+1. Whenever a land's ability causes you to add one or more mana of the chosen color, add one additional mana of that color.

As this artifact enters, choose a creature type. Creature spells you cast of the chosen type cost {1} less to cast. At the beginning of your upkeep, look at the top card of your library. If it's a creature card of the chosen type, you may reveal it and put it into your hand.

{T}: Add one mana of any color. {1}, {T}: Untap target legendary creature you control.

Equipped creature gets +1/-1. Whenever equipped creature dies, draw two cards. Equip {1}

Pestilence Rats's power is equal to the number of other Rats on the battlefield. (For example, as long as there are two other Rats on the battlefield, Pestilence Rats's power and toughness are 2/3.)

When this creature enters, create a number of 1/1 black Rat creature tokens equal to the number of opponents you have. {1}{B}, Sacrifice a creature: Target creature gets -2/-2 until end of turn.

Whenever another nontoken creature dies, you may create a 1/1 black Rat creature token. Rats you control have deathtouch.

Black creatures get +1/+1.

Whenever a creature dies, put a charge counter on this enchantment. At the beginning of your first main phase, add {B} for each charge counter on this enchantment.

Black creature spells you cast cost {1} less to cast. Whenever you cast a creature spell, each opponent loses 1 life and you gain 1 life.

This artifact enters tapped. {T}: Add {B}.

Search your library for a card, put that card into your hand, then shuffle.

{X}: This creature deals X damage to each creature and each player. Spend only black mana on X.

When this creature dies, you may pay {B}. If you do, target player discards a card.

Each opponent's maximum hand size is reduced by two.

{B}, Sacrifice a creature: Target player discards a card. Activate only as a sorcery.

This creature gets +1/+0 for each other Rat you control. A deck can have any number of cards named Rat Colony.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Changeling (This card is every creature type.) When this creature enters, you may return target creature card from your graveyard to your hand.

Each opponent's maximum hand size is reduced by one.

{B}, Sacrifice a creature: Destroy target nonblack creature.

Target creature gets -1/-1 until end of turn for each Swamp you control.

Destroy target nonblack creature.

Destroy target nonartifact creature.

Destroy all creatures you don't control. They can't be regenerated.

Ninjutsu {2}{B} ({2}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Whenever this creature deals combat damage to a player, destroy target nonblack creature that player controls.