When Abyssal Gatekeeper dies, each player sacrifices a creature.

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

Enchant creature

When Bestial Fury enters the battlefield, draw a card at the beginning of the next turn's upkeep.

Whenever enchanted creature becomes blocked, it gets +4/+0 and gains trample until end of turn.

Flash

Enchant creature

At the beginning of your upkeep, you lose 1 life.

{0}: Regenerate enchanted 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.

{4}, {T}: Each player who controls a permanent named Bonder's Ornament draws a card.

Target creature gets +2/+0 until end of turn. Regenerate it. You lose 2 life.

Animate Chains -- When Chain Devil enters the battlefield, each player sacrifices a nontoken creature.

Target player sacrifices a creature.

Flashback {5}{B}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Clay Revenant enters the battlefield tapped.

{2}{B}: Return Clay Revenant from your graveyard to your hand.

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

{T}: Add {C}.

{3}, {T}, Sacrifice Cradle of the Accursed: Create a 2/2 black Zombie creature token. Activate only as a sorcery.

Mountaincycling {2} ({2}, Discard this card: Search your library for a Mountain card, reveal it, put it into your hand, then shuffle.)

Backup 2 (When this creature enters the battlefield, put two +1/+1 counters on target creature. If that's another creature, it gains the following ability until end of turn.)

Trample

When Demon's Disciple enters the battlefield, each player sacrifices a creature or planeswalker.

When Dwarven Hammer enters the battlefield, you may pay {2}. If you do, create a 2/1 red Dwarf Berserker creature token, then attach Dwarven Hammer to it.

Equipped creature gets +3/+0 and has trample.

Equip {3}

Siege Monster -- When Earth-Cult Elemental enters the battlefield, roll a d20.

1--9 | Each player sacrifices a permanent.

10--19 | Each opponent sacrifices a permanent.

20 | Each opponent sacrifices two permanents.

Enchant creature you control

When Etali's Favor enters the battlefield, discover 3. (Exile cards from the top of your library until you exile a nonland card with mana value 3 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

Enchanted creature gets +1/+1 and has trample.

Enchant creature

Enchanted creature has lifelink and "Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature." (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)

As an additional cost to cast this spell, you may collect evidence 6. (Exile cards with total mana value 6 or greater from your graveyard.)

Each opponent sacrifices a creature. If evidence was collected, instead each opponent sacrifices a creature with the greatest power among creatures they control.

Until end of turn, target creature gets +2/+0 and gains "When this creature dies, return it to the battlefield tapped under its owner's control and you create a Treasure token." (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

Flying

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

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

Until end of turn, target creature gains "When this creature dies, return it to the battlefield tapped under its owner's control with a +1/+1 counter on it."

When Fleshbag Marauder enters the battlefield, each player sacrifices a creature.

Destroy target nonartifact creature.

Sacrifice a Goblin: Regenerate target creature.

Haste

When Harried Spearguard dies, create a 1/1 black Rat creature token with "This creature can't block."

When Haunt of the Dead Marshes enters the battlefield, scry 1.

{2}{B}: Return Haunt of the Dead Marshes from your graveyard to the battlefield tapped. Activate only if you control a legendary creature.

Equipped creature has vigilance, trample, and haste.

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

{T}: Add {C}.

{3}, {T}, Sacrifice Haunted Fengraf: Return a creature card at random from your graveyard to your hand.

Hidden Necropolis enters the battlefield tapped.

{T}: Add {B}.

{4}{B}, {T}, Sacrifice Hidden Necropolis: Discover 4. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 4 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

Hidden Volcano enters the battlefield tapped.

{T}: Add {R}.

{4}{R}, {T}, Sacrifice Hidden Volcano: Discover 4. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 4 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

Whenever another creature dies, you may have Hissing Iguanar deal 1 damage to target player or planeswalker.

{T}: Add one mana of any color.

{2}, {T}: Exile target card from a graveyard.

Choose two target creatures controlled by the same player. That player sacrifices one of them.

Each player sacrifices a creature.

Decimate -- When Legate Lanius enters the battlefield, each opponent sacrifices a tenth of the creatures they control, rounded up.

Whenever an opponent sacrifices a creature, put a +1/+1 counter on Legate Lanius.

Enchant creature

At the beginning of the end step of enchanted creature's controller, that player sacrifices that creature.

This spell costs {X} less to cast, where X is the greatest power among creatures you control.

Trample

Whenever a player sacrifices a creature, you may put a +1/+1 counter on Mortician Beetle.

Mortuary Mire enters the battlefield tapped.

When Mortuary Mire enters the battlefield, you may put target creature card from your graveyard on top of your library.

{T}: Add {B}.

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

Roll a d20.

1--9 | Choose an opponent. That player sacrifices a creature.

10--19 | Each opponent sacrifices a creature.

20 | Each opponent sacrifices a creature with the greatest power among creatures that player controls.

When Nested Shambler dies, create X tapped 1/1 green Squirrel creature tokens, where X is Nested Shambler's power.

You draw two cards and you lose 2 life.

Until end of turn, target creature you control gains "When this creature dies, return it to the battlefield tapped under its owner's control, then create a Wicked Role token attached to it." (Enchanted creature gets +1/+1. When this Aura is put into a graveyard, each opponent loses 1 life.)

Target creature you control gains indestructible until end of turn. Draw a card if that creature has a +1/+1 counter on it. (Damage and effects that say "destroy" don't destroy the creature.)

Trample

Whenever Oliphaunt attacks, another target creature you control gets +2/+0 and gains trample until end of turn.

Mountaincycling {1} ({1}, Discard this card: Search your library for a Mountain card, reveal it, put it into your hand, then shuffle.)

When Oubliette enters the battlefield, target creature phases out until Oubliette leaves the battlefield. Tap that creature as it phases in this way. (Auras and Equipment phase out with it. While permanents are phased out, they're treated as though they don't exist.)

{2}{B}: Return Persistent Specimen from your graveyard to the battlefield tapped.

Choose one --

• Target opponent sacrifices a creature.

• Target opponent sacrifices an enchantment.

{3}{B/P}: Transform Pyretic Prankster. Activate only as a sorcery. ({B/P} can be paid with either {B} or 2 life.)

When Glistening Goremonger dies, each opponent sacrifices an artifact or creature.

Rakdos Carnarium enters the battlefield tapped.

When Rakdos Carnarium enters the battlefield, return a land you control to its owner's hand.

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

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

Scry 2, then draw two cards. You lose 2 life.

Exile the top two cards of your library. Until the end of your next turn, you may play those cards.

Exploit (When this creature enters the battlefield, you may sacrifice a creature.)

When Rot-Tide Gargantua exploits a creature, each opponent sacrifices a creature.

{2}{B}: Return Sanitarium Skeleton from your graveyard to your hand.

Target player draws two cards and loses 2 life.

When Slum Reaper enters the battlefield, each player sacrifices a creature.

Sulfurous Blast deals 2 damage to each creature and each player. If you cast this spell during your main phase, Sulfurous Blast deals 3 damage to each creature and each player instead.

Until end of turn, target creature gets +2/+0 and gains "When this creature dies, return it to the battlefield tapped under its owner's control."

({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}.)

Commander creatures you own have "At the beginning of your upkeep, exile the top card of your library. This creature gets +X/+0 until end of turn, where X is that card's mana value. You may play that card this turn."

Target creature gains double strike until end of turn.

Ferocious -- That creature also gains trample until end of turn if you control a creature with power 4 or greater.

Destroy target creature. It can't be regenerated.

The Autonomous Furnace enters the battlefield tapped.

{T}: Add {R}.

{1}{R}, {T}, Sacrifice The Autonomous Furnace: Draw a card.

The Dross Pits enters the battlefield tapped.

{T}: Add {B}.

{1}{B}, {T}, Sacrifice The Dross Pits: Draw a card.

When Tithing Blade enters the battlefield, each opponent sacrifices a creature.

Craft with creature {4}{B} ({4}{B}, Exile this artifact, Exile a creature you control or a creature card from your graveyard: Return this card transformed under its owner's control. Craft only as a sorcery.)

At the beginning of your upkeep, each opponent loses 1 life and you gain 1 life.

{T}: Add {C}.

{3}, {T}: Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

{B}, Discard a creature card: Return target creature card from your graveyard to your hand.

Target creature gets -1/-1 until end of turn.

Morbid -- That creature gets -13/-13 until end of turn instead if a creature died this turn.

Tramway Station enters the battlefield tapped.

{T}: Add {B} or {R}.

{2}{B}{R}, {T}, Sacrifice Tramway Station: Draw a card.

Troll of Khazad-dûm can't be blocked except by three or more creatures.

Swampcycling {1} ({1}, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)

Until end of turn, target creature gains "When this creature dies, return it to the battlefield tapped under its owner's control with a +1/+1 counter on it."

Devoid (This card has no color.)

Target creature gets +2/+0 until end of turn. Regenerate it.

{T}: Add {C}.

{7}, {T}, Sacrifice Unstable Obelisk: Destroy target permanent.

Each opponent sacrifices a creature or planeswalker and gets a poison counter.

Equipped creature can't be blocked and has shroud. (It can't be the target of spells or abilities.)

Equip {2}

Exile the top two cards of your library. Until the end of your next turn, you may play those cards.