Flying

When Archfiend of Sorrows enters, creatures your opponents control get -2/-2 until end of turn.

Unearth {3}{B}{B} ({3}{B}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

When Burglar Rat enters the battlefield, each opponent discards 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.

Flying

When Demon of Dark Schemes enters the battlefield, all other creatures get -2/-2 until end of turn.

Whenever another creature dies, you get {E} (an energy counter).

{2}{B}, Pay {E}{E}{E}{E}: Put target creature card from a graveyard onto the battlefield under your control tapped.

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

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

When Gray Merchant of Asphodel enters the battlefield, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)

As long as Grist, the Hunger Tide isn't on the battlefield, it's a 1/1 Insect creature in addition to its other types.

+1: Create a 1/1 black and green Insect creature token, then mill a card. If an Insect card was milled this way, put a loyalty counter on Grist and repeat this process.

-2: You may sacrifice a creature. When you do, destroy target creature or planeswalker.

-5: Each opponent loses life equal to the number of creature cards in your graveyard.

Flying

When Kokusho, the Evening Star dies, each opponent loses 5 life. You gain life equal to the life lost this way.

Menace

When Massacre Girl enters the battlefield, each other creature gets -1/-1 until end of turn. Whenever a creature dies this turn, each creature other than Massacre Girl gets -1/-1 until end of turn.

When Merciless Executioner enters, each player sacrifices a creature.

All lands become 2/2 creatures until end of turn. They're still lands.

All lands are 2/2 creatures that are still lands.

Deathtouch

When Night Incarnate leaves the battlefield, all creatures get -3/-3 until end of turn.

Evoke {3}{B} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)

If an artifact or creature entering the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

{X}, Sacrifice Pernicious Deed: Destroy each artifact, creature, and enchantment with mana value X or less.

When The Meathook Massacre enters the battlefield, each creature gets -X/-X until end of turn.

Whenever a creature you control dies, each opponent loses 1 life.

Whenever a creature an opponent controls dies, you gain 1 life.

When Virus Beetle enters, each opponent discards a card.

Defender

When Wall of Blossoms enters, draw a card.

When Yarok's Fenlurker enters the battlefield, each opponent exiles a card from their hand.

{2}{B}: Yarok's Fenlurker gets +1/+1 until end of turn.