Flying

Whenever you cycle or discard another card, put a -1/-1 counter on each creature your opponents control.

Cycling {2} ({2}, Discard this card: Draw a card.)

Lifelink

When Baleful Ammit enters the battlefield, put a -1/-1 counter on target creature you control.

When Banewhip Punisher enters the battlefield, you may put a -1/-1 counter on target creature.

{B}, Sacrifice Banewhip Punisher: Destroy target creature that has a -1/-1 counter on it.

Enchant creature

You control enchanted creature.

At the beginning of your upkeep, put a -1/-1 counter on enchanted creature.

Whenever a creature dies, if it had a -1/-1 counter on it, put a -1/-1 counter on target creature.

Flying

Carnifex Demon enters the battlefield with two -1/-1 counters on it.

{B}, Remove a -1/-1 counter from Carnifex Demon: Put a -1/-1 counter on each other creature.

{T}: Target player discards a card. Activate only during your turn.

Put a -1/-1 counter on Cinderhaze Wretch: Untap Cinderhaze Wretch.

At the beginning of your upkeep, destroy target creature with a -1/-1 counter on it.

Whenever Dusk Urchins attacks or blocks, put a -1/-1 counter on it.

When Dusk Urchins dies, draw a card for each -1/-1 counter on it.

When Festering Mummy dies, you may put a -1/-1 counter on target creature.

{2}{B}{B}: Put a -1/-1 counter on target creature.

You may choose not to untap Giant Oyster during your untap step.

{T}: For as long as Giant Oyster remains tapped, target tapped creature doesn't untap during its controller's untap step, and at the beginning of each of your draw steps, put a -1/-1 counter on that creature. When Giant Oyster leaves the battlefield or becomes untapped, remove all -1/-1 counters from the creature.

Flying

{U}, Sacrifice Glen Elendra Archmage: Counter target noncreature spell.

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Enchant creature

Enchanted creature has infect.

At the beginning of your upkeep, put a -1/-1 counter on enchanted creature.

When Glistening Oil is put into a graveyard from the battlefield, return Glistening Oil to its owner's hand.

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Put a -1/-1 counter on target creature, then proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

At the beginning of your upkeep, put a -1/-1 counter on each creature.

Put a -1/-1 counter on target creature, two -1/-1 counters on another target creature, and three -1/-1 counters on a third target creature.

Put a -1/-1 counter on target creature.

Draw a card.

Leech Bonder enters the battlefield with two -1/-1 counters on it.

{U}, {Q}: Move a counter from target creature onto a second target creature. ({Q} is the untap symbol.)

As an additional cost to cast this spell, put a -1/-1 counter on a creature you control.

Destroy target creature.

Put a -1/-1 counter on each creature you don't control. You may search your library and/or graveyard for a card named Liliana, Death Wielder, reveal it, and put it into your hand. If you search your library this way, shuffle.

+2: Put a -1/-1 counter on up to one target creature.

-3: Destroy target creature with a -1/-1 counter on it.

-10: Return all creature cards from your graveyard to the battlefield.

Wither (This deals damage to creatures in the form of -1/-1 counters.)

At the beginning of your upkeep, put a -1/-1 counter on each nonblack creature.

Wither (This deals damage to creatures in the form of -1/-1 counters.)

Whenever a creature an opponent controls with a -1/-1 counter on it dies, you may return that card to the battlefield under your control.

Return target nonlegendary creature card from your graveyard to the battlefield with a -1/-1 counter on it.

Flying

When Puppeteer Clique enters the battlefield, put target creature card from an opponent's graveyard onto the battlefield under your control. It gains haste. At the beginning of your next end step, exile it.

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Whenever River Kelpie or another permanent enters the battlefield from a graveyard, draw a card.

Whenever a player casts a spell from a graveyard, draw a card.

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Whenever you cycle or discard a card, you may pay {1}. If you do, put a -1/-1 counter on target creature.

Enchant creature

Enchanted creature has "{B}, {T}: Put a -1/-1 counter on target creature."

As an additional cost to cast this spell, put a -1/-1 counter on a creature you control.

Draw two cards.

Enchant creature

Enchanted creature doesn't untap during its controller's untap step.

Enchanted creature has "{1}, Put a -1/-1 counter on this creature: Untap this creature."

When you control no Islands, sacrifice Skeleton Ship.

{T}: Put a -1/-1 counter on target creature.

When Soul Snuffers enters the battlefield, put a -1/-1 counter on each creature.

When Soulstinger enters the battlefield, put two -1/-1 counters on target creature you control.

When Soulstinger dies, you may put a -1/-1 counter on target creature for each -1/-1 counter on Soulstinger.

Enchant creature

Enchanted creature gets +3/+3.

At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that creature.

{2}{U}, {T}: Put a -1/-1 counter on target creature. You may tap or untap that creature.

Put a -1/-1 counter on target creature. When that creature dies this turn, its controller gets a poison counter.

Protection from Humans

Pay 1 life, Sacrifice another creature: Put a -1/-1 counter on up to one target creature and draw a card.

{B}{B}, Discard a card: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)