Enchant player
At the beginning of each end step, enchanted player gains life equal to the amount of life they've gained this turn, then loses life equal to the amount of life they've lost this turn.

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.

When Grim Physician dies, target creature an opponent controls gets -1/-1 until end of turn.

Favored
Whenever your Champion attacks, scry 1.

Ward—Sacrifice a permanent.
Whenever Host of the Neverending Revel enters the battlefield or attacks, each player sacrifices a nonland, nontoken permanent. For each player who doesn't, you draw a card.

Destroy target creature or enchantment you don't control. If your devotion to black is three or greater, you gain 3 life.

When Kakomanties Circle enters the battlefield, create a 2/2 black Zombie creature token.
Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life.

Deathtouch
Whenever a creature you control with deathtouch deals damage to a planeswalker, destroy that planeswalker.
Whenever a creature you control deals combat damage to a player, put a deathtouch counter on it. If it already had deathtouch, create a tapped Treasure token instead.

Lifelink
Whenever Lurking Vyrkolakas enters the battlefield or attacks, target player exiles a card from their graveyard. If a nonland card was exiled this way, put a +1/+1 counter on Lurking Vyrkolakas and you gain 1 life.

Destroy target creature or planeswalker if it has mana value 3 or less or if you control a legendary creature.

Each opponent separates the creatures they control into two piles. For each opponent, you choose one of their piles. Each opponent sacrifices the creatures in their chosen pile.

You may cast this spell as though it had flash as long as your devotion to black is three or greater.
Scry 2, then draw two cards. You lose 2 life.

Whenever Nyxborn Retriever attacks, if defending player has eight or more cards in their graveyard, Nyxborn Retriever gets +2/+1 and gains menace until end of turn.

Flash
When Omen of Slaughter enters the battlefield, each opponent sacrifices a creature or planeswalker.
{2}{B}, Sacrifice Omen of Slaughter: Scry 2.

Enchant creature
Whenever enchanted creature attacks, put a +1/+1 counter on it. Then if it has three or more +1/+1 counters on it, sacrifice Ordeal of Pharika.
Whenever you sacrifice Ordeal of Pharika, creatures your opponents control get -2/-2 until end of turn.

Each opponent discards two cards, then mills two cards.
Each opponent loses 2 life and you gain 2 life.
For each opponent that has eight or more cards in their graveyard, exile a card from that player's graveyard. You may cast cards exiled this way this turn, and mana of any type can be spent to cast cast it.

Favored
Your Champion has deathtouch.

Deathtouch
Whenever Pharika's Harbinger deals combat damage to a player, bless target creature that player controls.

Enchant creature
Enchanted creature has “At the beginning of your upkeep, sacrifice a creature. If you can't, you lose 3 life.”

Once each turn, when you cast a black spell with mana value less than your devotion to black, you may draw a card and lose 1 life.

When Phenax's Touch enters the battlefield, each opponent discards a card and loses 1 life.
{1}{B}, Sacrifice Phenax's Touch: You draw a card and you lose 1 life.

Each player mills two cards. When you do, return target creature card from your graveyard to your hand.

Poisoned Strike deals 3 damage to target creature. That creature's controller mills three cards.

Enchant creature
Enchanted creature gets -X/-X, where X is your devotion to black.

Flying
Whenever one or more creatures you control deal combat damage to a player, that player mills two cards.