Nekrataal

First strike
When Nekrataal enters the battlefield, destroy target nonartifact, nonblack creature. That creature can’t be regenerated.

Doomsday

Search your library and graveyard for five cards and exile the rest. Put the chosen cards on top of your library in any order. You lose half your life, rounded up.

Black Knight

First strike (This creature deals combat damage before creatures without first strike.)
Protection from white (This creature can’t be blocked, targeted, dealt damage, or enchanted by anything white.)

Nekrataal

First strike
When Nekrataal enters the battlefield, destroy target nonartifact, nonblack creature. That creature can’t be regenerated.

Nekrataal

First strike
When Nekrataal enters the battlefield, destroy target nonartifact, nonblack creature. That creature can’t be regenerated.

Black Knight

First strike (This creature deals combat damage before creatures without first strike.)
Protection from white (This creature can’t be blocked, targeted, dealt damage, or enchanted by anything white.)

Fallen Askari

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
Fallen Askari can’t block.

Maraxus of Keld

Maraxus of Keld’s power and toughness are each equal to the number of untapped artifacts, creatures, and lands you control.

Doomsday

Search your library and graveyard for five cards and exile the rest. Put the chosen cards on top of your library in any order. You lose half your life, rounded up.

Wave of Terror

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
At the beginning of your draw step, destroy each creature with converted mana cost equal to the number of age counters on Wave of Terror. They can’t be regenerated.

Mercenary Knight

When Mercenary Knight enters the battlefield, sacrifice it unless you discard a creature card.

Cruel Fate

Look at the top five cards of target opponent’s library. Put one of those cards into that player’s graveyard and the rest on top of their library in any order.

Lava Axe

Lava Axe deals 5 damage to target player or planeswalker.

Earthquake

Earthquake deals X damage to each creature without flying and each player.

Noxious Toad

When Noxious Toad dies, each opponent discards a card.

Cruel Bargain

Draw four cards. You lose half your life, rounded up.

Black Knight

First strike (This creature deals combat damage before creatures without first strike.)
Protection from white (This creature can’t be blocked, targeted, dealt damage, or enchanted by anything white.)

Shapeshifter

As Shapeshifter enters the battlefield, choose a number between 0 and 7.
At the beginning of your upkeep, you may choose a number between 0 and 7.
Shapeshifter’s power is equal to the last chosen number and its toughness is equal to 7 minus that number.

Breeding Pit

At the beginning of your upkeep, sacrifice Breeding Pit unless you pay .
At the beginning of your end step, create a 0/1 black Thrull creature token.

Mole Worms

You may choose not to untap Mole Worms during your untap step.
: Tap target land. It doesn’t untap during its controller’s untap step for as long as Mole Worms remains tapped.

Nekrataal

First strike
When Nekrataal enters the battlefield, destroy target nonartifact, nonblack creature. That creature can’t be regenerated.

Fallen Askari

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
Fallen Askari can’t block.

Grave Servitude

You may cast Grave Servitude as though it had flash. If you cast it any time a sorcery couldn’t have been cast, the controller of the permanent it becomes sacrifices it at the beginning of the next cleanup step.
Enchant creature
Enchanted creature gets +3/-1 and is black.