You draw three cards and you lose 3 life.

Enchant Equipment

At the beginning of your upkeep, if enchanted Equipment is attached to a creature, destroy that creature.

Sacrifice a creature: Add {C}{C}.

Destroy target untapped creature.

Bog Rats can't be blocked by Walls.

Menace, indestructible

Bontu the Glorified can't attack or block unless a creature died under your control this turn.

{1}{B}, Sacrifice another creature: Scry 1. Each opponent loses 1 life and you gain 1 life.

When Burglar Rat enters the battlefield, each opponent discards a card.

{2}, {T}: Add {B} for each Swamp you control.

{T}: Add {C}.

{3}, {T}: Add {B} for each basic Swamp you control.

When Chittering Rats enters the battlefield, target opponent puts a card from their hand on top of their library.

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

Dakmor Salvage enters the battlefield tapped.

{T}: Add {B}.

Dredge 2 (If you would draw a card, you may mill two cards instead. If you do, return this card from your graveyard to your hand.)

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

Spell mastery -- If there are two or more instant and/or sorcery cards in your graveyard, add {B}{B}{B}.

As long as you have seven or more cards in hand, Deathmask Nezumi gets +2/+1 and has fear. (It can't be blocked except by artifact creatures and/or black creatures.)

Return target creature card from your graveyard to your hand.

Destroy target nonblack creature.

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

{1}{B}, {T}, Sacrifice Executioner's Capsule: Destroy target nonblack creature.

Destroy all nonenchantment creatures.

Destroy target nonblack creature. Its controller loses 2 life.

{1}, {T}: Tap target artifact, creature, or land.

Ninjutsu {3}{B}{B} ({3}{B}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever Ink-Eyes, Servant of Oni deals combat damage to a player, you may put target creature card from that player's graveyard onto the battlefield under your control.

{1}{B}: Regenerate Ink-Eyes.

Each player sacrifices a creature.

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)

{1}{B}: Regenerate Kuro's Taken.

({T}: Add {B}.)

Leechridden Swamp enters the battlefield tapped.

{B}, {T}: Each opponent loses 1 life. Activate only if you control two or more black permanents.

Destroy target creature. Add {B}{B}{B}.

All Rats have fear.

{T}, Sacrifice a Rat: Create X 1/1 black Rat creature tokens, where X is the number of Rats you control.

Undergrowth -- Search your library for a black card with mana value less than or equal to the number of creature cards in your graveyard, reveal it, put it into your hand, then shuffle.

Destroy target creature.

All creatures get -1/-1 until end of turn for each Swamp you control.

{1}{B}, {T}: Target opponent discards a card. Then if that player has no cards in hand, flip Nezumi Shortfang.

At the beginning of each opponent's upkeep, that player loses 1 life for each card fewer than three in their hand.

You draw two cards and you lose 2 life.

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

Rats you control have deathtouch.

Ninjutsu {3}{B} ({3}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever Okiba-Gang Shinobi deals combat damage to a player, that player discards two cards.

At the beginning of your upkeep, if you have four or more creature cards in your graveyard, you may return target creature card from your graveyard to your hand.

Pack Rat's power and toughness are each equal to the number of Rats you control.

{2}{B}, Discard a card: Create a token that's a copy of Pack Rat.

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

Rat offering (You may cast this card any time you could cast an instant by sacrificing a Rat and paying the difference in mana costs between this and the sacrificed Rat. Mana cost includes color.)

Whenever a permanent is put into an opponent's graveyard, that player loses 1 life.

At the beginning of your upkeep, you draw a card and you lose 1 life.

{T}: Add {B}.

{2}{B}: Phyrexian Totem becomes a 5/5 black Phyrexian Horror artifact creature with trample until end of turn.

Whenever Phyrexian Totem is dealt damage, if it's a creature, sacrifice that many permanents.

{2}, {T}, Sacrifice a creature: Draw a card.

As Pillar of Origins enters the battlefield, choose a creature type.

{T}: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type.

This spell costs {2} less to cast if it targets a legendary creature.

Destroy target creature.

Surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Skulk (This creature can't be blocked by creatures with greater power.)

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

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

At the beginning of your upkeep, you may search your library for a Rat card, reveal it, put it into your hand, then shuffle.

{T}: Put a charge counter on Ratchet Bomb.

{T}, Sacrifice Ratchet Bomb: Destroy each nonland permanent with mana value equal to the number of charge counters on Ratchet Bomb.

{B}: Destroy target artifact, creature, or land you control.

When Ravenous Rats enters the battlefield, target opponent discards a card.

You have no maximum hand size.

{T}: Add {C}.

{2}: Regenerate equipped creature. (The next time that creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)

At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's black.

Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

{T}: Add {C}.

{4}, {T}: Target creature can't be blocked this turn.

When Rotting Rats enters the battlefield, each player discards a card.

Unearth {1}{B} ({1}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Deathtouch

When Ruin Rat dies, exile target card from an opponent's graveyard.

Destroy target creature or planeswalker.

Awaken 4--{5}{B}{B} (If you cast this spell for {5}{B}{B}, also put four +1/+1 counters on target land you control and it becomes a 0/0 Elemental creature with haste. It's still a land.)

{T}: Target player exiles a card from their graveyard.

{1}, Sacrifice Scrabbling Claws: Exile target card from a graveyard. Draw a card.

Strive -- This spell costs {2}{B} more to cast for each target beyond the first.

Exile any number of target creatures and all Auras attached to them.

Ninjutsu {B} ({B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever Skullsnatcher deals combat damage to a player, exile up to two target cards from that player's graveyard.

{T}, Tap an untapped creature you control: Add one mana of any color.

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

{T}: Add {C}.

{T}: Regenerate target Insect, Rat, Spider, or Squirrel. (The next time it would be destroyed, instead tap it, remove it from combat, and heal all damage on it.)

Whenever a source you control other than Talon of Pain deals damage to an opponent, put a charge counter on Talon of Pain.

{X}, {T}, Remove X charge counters from Talon of Pain: It deals X damage to any target.

Target creature gets -3/-2 until end of turn.

You have no maximum hand size.

{T}: Add {C}.

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

Enchant land

Enchanted land has "{T}, Pay 1 life: Draw a card."

Flying, deathtouch, lifelink

Worn Powerstone enters the battlefield tapped.

{T}: Add {C}{C}.