Creatures you control have menace.

−2: Amass Zombies 2. (Put two +1/+1 counters on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

+1: Each opponent discards a card and loses 2 life.

−3: Gain control of target creature until end of turn. Untap it. It gains haste until end of turn. Sacrifice it at the beginning of the next end step if it has mana value 3 or less.

−8: Each opponent loses life equal to the number of cards in their graveyard.

Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)

When Blightbelly Rat dies, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

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

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

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

When this creature enters the battlefield, target opponent discards a card.

When Disease Carriers dies, target creature gets -2/-2 until end of turn.

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

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

Hellbent — As long as you have no cards in hand, Gobhobbler Rats gets +1/+0 and has ": Regenerate Gobhobbler Rats." (The next time it would be destroyed, instead tap it, remove it from combat, and heal all damage on it.)

At the beginning of combat on your turn, return target Vehicle card from your graveyard to the battlefield. It gains haste. Return it to its owner's hand at the beginning of your next end step.

Haste

When Hellhole Rats enters the battlefield, target player discards a card. Hellhole Rats deals damage to that player equal to that card's mana value.

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

When Ichor Rats enters the battlefield, each player gets a poison counter.

Ninjutsu (, 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.

: Regenerate Ink-Eyes.

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

: Regenerate Kuro's Taken.

Whenever another Rat enters the battlefield under your control, exile up to one target card from an opponent's graveyard.

At the beginning of combat on your turn, create a 1/1 black Rat creature token with "This creature can't block."

All Rats have fear.

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

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

Lifelink

Menace, ward

Whenever Nashi, Moon's Legacy attacks, exile up to one target legendary or Rat card from your graveyard and copy it. You may cast the copy. (You still pay its costs. A copy of a permanent spell becomes a token.)

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

Menace

When Nezumi Freewheeler enters the battlefield, each player mills three cards. (To mill three cards, a player puts the top three cards of their library into their graveyard.)

: Transform Nezumi Freewheeler. Activate only as a sorcery. ( can be paid with either or 2 life.)

When Nezumi Informant enters the battlefield, each opponent discards a card.

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

When Nezumi Prowler enters the battlefield, target creature you control gains deathtouch and lifelink until end of turn.

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

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

Ninjutsu (, 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.

When Ossuary Rats enters the battlefield, it deals X damage to target creature or planeswalker an opponent controls, where X is the number of creature cards in your graveyard.

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

Deathtouch

When Plaguecrafter's Familiar enters the battlefield, choose a creature card in your hand. It perpetually gains deathtouch.

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.)

, Sacrifice Rat in the Hat: Until end of turn, you may cast target creature card that has a hat from your graveyard.

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

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.

Deathtouch

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

When Sanity Gnawers enters the battlefield, target player discards a card at random.

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Whenever Septic Rats attacks, if defending player is poisoned, it gets +1/+1 until end of turn.

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

Ninjutsu abilities you activate cost less to activate.

Other Ninja and Rogue creatures you control get +1/+1.

Ninjutsu (, 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.

Shadow (This creature can block or be blocked by only creatures with shadow.)

Whenever Stronghold Rats deals combat damage to a player, each player discards a card.

Tangled Colony can't block.

When Tangled Colony dies, create X 1/1 black Rat creature tokens with "This creature can't block," where X is the amount of damage dealt to it this turn.

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

Whenever Throat Slitter deals combat damage to a player, destroy target nonblack creature that player controls.

When Voracious Vermin enters the battlefield, create a 1/1 black Rat creature token with "This creature can't block."

Whenever another creature you control dies, put a +1/+1 counter on Voracious Vermin.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)