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

Buyback {3} (You may pay an additional {3} as you cast this spell. If you do, put this card into your hand as it resolves.) Return target creature card from your graveyard to your hand.

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

Flying Whenever Falkenrath Noble or another creature dies, target player loses 1 life and you gain 1 life.

Defender When Akroan Horse enters the battlefield, an opponent gains control of it. At the beginning of your upkeep, each opponent creates a 1/1 white Soldier creature token.

Whenever a nontoken creature enters the battlefield, if Genesis Chamber is untapped, that creature's controller creates a 1/1 colorless Myr artifact creature token.

First strike At the beginning of each opponent's end step, that player creates a 1/1 red Goblin creature token with "Creatures you control attack each combat if able."

At the beginning of each player's upkeep, that player mills a card. Then they create X 1/1 black Minion creature tokens, where X is the milled card's mana value.

When Slaughter Specialist enters the battlefield, each opponent creates a 1/1 white Human creature token. Whenever a creature an opponent controls dies, put a +1/+1 counter on Slaughter Specialist.

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.

Put X -1/-1 counters on each creature. Shuffle Black Sun's Zenith into its owner's library.

Put a -1/-1 counter on target creature. Blur of Blades deals 2 damage to that creature's controller.

This spell costs {3} less to cast if you control a creature with power 4 or greater. Change the target of target spell or ability with a single target.

When Contagion Clasp enters the battlefield, put a -1/-1 counter on target creature. {4}, {T}: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

When Cultbrand Cinder enters the battlefield, put a -1/-1 counter on target creature.

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

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

Sacrifice Fume Spitter: Put a -1/-1 counter on target creature.

({B/P} can be paid with either {B} or 2 life.) When Pith Driller enters the battlefield, put a -1/-1 counter on target creature.

Puncture Bolt deals 1 damage to target creature. Put a -1/-1 counter on that creature.

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

Buyback {3} (You may pay an additional {3} as you cast this spell. If you do, put this card into your hand as it resolves.) Destroy target artifact.

When Skinrender enters the battlefield, put three -1/-1 counters on target creature.

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

Bojuka Bog enters the battlefield tapped. When Bojuka Bog enters the battlefield, exile target player's graveyard. {T}: Add {B}.

{T}: Add one mana of any color in your commander's color identity.

Dragonskull Summit enters the battlefield tapped unless you control a Swamp or a Mountain. {T}: Add {B} or {R}.

Dwarven Ruins enters the battlefield tapped. {T}: Add {R}. {T}, Sacrifice Dwarven Ruins: Add {R}{R}.

Ebon Stronghold enters the battlefield tapped. {T}: Add {B}. {T}, Sacrifice Ebon Stronghold: Add {B}{B}.

{T}: Add one mana of any color that a land an opponent controls could produce.

{T}: Add {C}. {T}: Add {B} or {R}. Lantern-Lit Graveyard doesn't untap during your next untap step.

({T}: Add {R}.)

Myriad Landscape enters the battlefield tapped. {T}: Add {C}. {2}, {T}, Sacrifice Myriad Landscape: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle.

Peat Bog enters the battlefield tapped with two depletion counters on it. {T}, Remove a depletion counter from Peat Bog: Add {B}{B}. If there are no depletion counters on Peat Bog, sacrifice it.

Sandstone Needle enters the battlefield tapped with two depletion counters on it. {T}, Remove a depletion counter from Sandstone Needle: Add {R}{R}. If there are no depletion counters on Sandstone Needle, sacrifice it.

{1}, {T}: Add {B}{R}.

{T}: Add {C}. {T}: Add {B} or {R}. Sulfurous Springs deals 1 damage to you.

({T}: Add {B}.)

Sacrifice another creature: Blood Bairn gets +2/+2 until end of turn.

Carrion Feeder can't block. Sacrifice a creature: Put a +1/+1 counter on Carrion Feeder.

Sacrifice a creature: Goblin Bombardment deals 1 damage to any target.

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.) Equip {0}

{T}: Add one mana of any color in your commander's color identity.

All Slivers have "Sacrifice this permanent: Add {B}{B}."

Sacrifice Blood Vassal: Add {B}{B}.

Sacrifice Catalyst Elemental: Add {R}{R}.

Add {B}{B}{B}.

Creature spells you cast cost {2} less to cast. Creatures you control get -1/-1.

Spells cost {1} less to cast.

Add {R} for each tapped land your opponents control.

Blue spells and red spells you cast cost {1} less to cast. {1}{B}: Regenerate Nightscape Familiar.

When Priest of Gix enters the battlefield, add {B}{B}{B}.

When Priest of Urabrask enters the battlefield, add {R}{R}{R}.

Sacrifice Reckless Barbarian: Add {R}{R}.

Menace {T}: Spells you cast this turn that are black and/or red cost {X} less to cast, where X is the amount of life you lost this turn. Activate only as a sorcery.

Add {R}{R}{R}{R}{R}.

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

First strike Black spells and green spells you cast cost {1} less to cast.

Create two 1/1 red Goblin creature tokens. Storm (When you cast this spell, copy it for each spell cast before it this turn.)

Blazing Volley deals 1 damage to each creature your opponents control.

End the Festivities deals 1 damage to each opponent and each creature and planeswalker they control.

Players can't gain life. Damage can't be prevented. All damage is dealt as though its source had wither. (A source with wither deals damage to creatures in the form of -1/-1 counters.)

Damage can't be prevented this turn. Fear, Fire, Foes! deals X damage to target creature and 1 damage to each other creature with the same controller.

Prowess If a source you control would deal noncombat damage to a creature an opponent controls, put that many -1/-1 counters on that creature instead.

Tectonic Hazard deals 1 damage to each opponent and each creature they control.

Tremor deals 1 damage to each creature without flying.