Commander creatures you own have "Whenever an artifact or creature you control is put into a graveyard from the battlefield, each opponent loses 1 life."

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

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

{3}, Sacrifice Burnished Hart: Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.

Flying

Whenever Butcher of Malakir or another creature you control dies, each opponent sacrifices a creature.

Flying

When Cadaver Imp enters the battlefield, you may return target creature card from your graveyard to your hand.

When Callous Bloodmage enters the battlefield, choose one --

• Create a 1/1 black and green Pest creature token with "When this creature dies, you gain 1 life."

• You draw a card and you lose 1 life.

• Exile target player's graveyard.

When Circuit Mender enters the battlefield, you gain 2 life.

When Circuit Mender leaves the battlefield, draw a card.

Clattering Augur can't block.

When Clattering Augur enters the battlefield, you draw a card and you lose 1 life.

{2}{B}{B}: Return Clattering Augur from your graveyard to your hand.

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

Flying

When Dark Revenant dies, put it on top of its owner's library.

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

When Disciple of Perdition dies, choose one. If you have exactly 13 life, you may choose both.

• You draw a card and you lose 1 life.

• Exile target opponent's graveyard. That player loses 1 life.

{1}{B}, Sacrifice an artifact or creature: Draw a card.

When Dusk Legion Zealot enters the battlefield, you draw a card and you lose 1 life.

When Dutiful Attendant dies, return another target creature card from your graveyard to your hand.

{2}{B}, Sacrifice another creature: Draw a card, then transform Ecstatic Awakener. Activate only once each turn.

When Elderfang Disciple enters the battlefield, each opponent discards a card.

When Elvish Doomsayer dies, each opponent discards a card.

Flying

Whenever Eye Collector deals combat damage to a player, each player mills a card.

Flying

When Eyetwitch dies, learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)

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

Deathtouch

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You draw a card and you lose 1 life. (Then exile this card. You may cast the creature later from exile.)

{T}: Each player mills a card.

Defender

{2}{B}, Sacrifice a creature: You gain 1 life and draw a card.

When Gravegouger enters the battlefield, exile up to two target cards from a single graveyard.

When Gravegouger leaves the battlefield, return the exiled cards to their owner's graveyard.

Morph {B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Whenever another nontoken creature you control dies, draw a card.

{T}: Add {C}.

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

{T}: Add {B}.

{T}: Add {C}.

Memorial to Folly enters the battlefield tapped.

{T}: Add {B}.

{2}{B}, {T}, Sacrifice Memorial to Folly: Return target creature card from your graveyard to your hand.

Whenever a nontoken creature you control dies, Midnight Reaper deals 1 damage to you and you draw a card.

{T}, Mill a card: Add {C}. (To mill a card, put the top card of your library into your graveyard.)

Flying

At the beginning of combat on your turn, each player mills three cards.

Flash

Enchant creature

When enchanted creature dies, return that card to the battlefield under your control.

Deathtouch

When Mire Triton enters the battlefield, mill two cards and you gain 2 life.

Equipped creature gets +0/+2 and has hexproof and "Whenever a creature with deathtouch blocks or becomes blocked by this creature, destroy that creature."

Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

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}.

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.

Flash

When Omen of the Dead enters the battlefield, return target creature card from your graveyard to your hand.

{2}{B}, Sacrifice Omen of the Dead: Scry 2.

Flying

Order of Midnight can't block.

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Return target creature card from your graveyard to your hand. (Then exile this card. You may cast the creature later from exile.)

Discard a card, Sacrifice Overeager Apprentice: Add {B}{B}{B}.

{T}: Mill two cards.

{2}, Exile Perpetual Timepiece: Shuffle any number of target cards from your graveyard into your library.

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

When Phyrexian Rager enters the battlefield, you draw a card and you lose 1 life.

Flying

When Pilgrim's Eye enters the battlefield, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.

When Poet's Quill enters the battlefield, learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)

Equipped creature gets +1/+1 and has lifelink.

Equip {1}{B}

When Returned Reveler dies, each player mills three cards.

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

Whenever Scaretiller becomes tapped, choose one --

• You may put a land card from your hand onto the battlefield tapped.

• Return target land card from your graveyard to the battlefield tapped.

{T}: Add one mana of any color.

{T}: Target creature becomes the color or colors of your choice until end of turn.

{T}: Add {C}.

{4}, {T}, Sacrifice Sequestered Stash: Mill five cards. Then you may put an artifact card from your graveyard on top of your library.

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

When Shriekmaw enters the battlefield, destroy target nonartifact, nonblack creature.

Evoke {1}{B} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)

When Skittering Surveyor enters the battlefield, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Kicker {2}{B}

Skyclave Shade can't block.

If Skyclave Shade was kicked, it enters the battlefield with two +1/+1 counters on it.

Landfall -- Whenever a land enters the battlefield under your control, if Skyclave Shade is in your graveyard and it's your turn, you may cast it from your graveyard this turn.

Flying

When Skyscanner enters the battlefield, draw a card.

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

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}.)

({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}.)

Whenever another creature dies, or a creature card is put into a graveyard from anywhere other than the battlefield, or a creature card leaves your graveyard, Syr Konrad, the Grim deals 1 damage to each opponent.

{1}{B}: Each player mills a card. (They each put the top card of their library into their graveyard.)

{T}: Add {C}.

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

{T}, Sacrifice Tormod's Crypt: Exile target player's graveyard.

Tymaret's toughness is equal to your devotion to black. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)

{1}{B}: Exile up to two target cards from graveyards. You gain 1 life for each creature card exiled this way.

When Undead Butler enters the battlefield, mill three cards. (Put the top three cards of your library into your graveyard.)

When Undead Butler dies, you may exile it. When you do, return target creature card from your graveyard to your hand.

Return target creature card with mana value 3 or less from your graveyard to the battlefield.

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

Menace (This creature can't be blocked except by two or more creatures.)

{2}{B}, Exile Unwilling Ingredient from your graveyard: You draw a card and you lose 1 life.

Choose two target creature cards in your graveyard. Sacrifice a creature. If you do, return the chosen cards to the battlefield tapped.

When Virus Beetle enters the battlefield, each opponent discards a card.

Sacrifice a creature: Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

(Gain the next level as a sorcery to add its ability.)

At the beginning of your end step, if a creature died this turn, each opponent loses 1 life.

{1}{B}: Level 2

When this Class becomes level 2, look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.

{6}{B}: Level 3

At the beginning of your end step, each opponent loses life equal to the life they lost this turn. (Damage causes loss of life.)

Target creature you control gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it. If its toughness is 0 or less, it's still put into its owner's graveyard.)

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