Black spells you cast cost less to cast.
If a nontoken creature an opponent controls would die, instead exile it and you gain 2 life.
, : Put target creature card exiled with The Darkness Crystal onto the battlefield tapped under your control with two additional +1/+1 counters on it.

: Put a sin counter on The Darkhold. Draw a card for each sin counter on it, then you lose 1 life for each card in your hand.
, : Each player's life total becomes the lowest life total among all players. Activate only as a sorcery.

Whenever a nonblack card is put into a player's graveyard from anywhere, that player loses 1 life.

Whenever chaos ensues, each opponent discards a card.

Affinity for Daleks
Other Daleks you control have haste.
At the beginning of combat on your turn, each opponent faces a villainous choice — That player sacrifices a creature of their choice, or you create a 3/3 black Dalek artifact creature token with menace.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
For each player, destroy up to one target creature that player controls. For each creature destroyed this way, its controller creates a 3/3 green Mutant creature token with deathtouch.
Target nontoken creature becomes a 6/6 legendary Horror creature named Fenric and loses all abilities.
Target Mutant fights another target creature named Fenric.

Create four 1/1 colorless Hero creature tokens. Then put a +1/+1 counter on each creature you control.

Read ahead (Choose a chapter and start with that many lore counters. Add one after your draw step. Skipped chapters don't trigger. Sacrifice after III.)
Target opponent reveals their hand. You choose a creature or planeswalker card from it. That player discards that card.
Search your library for a card, put that card into your hand, then shuffle. You lose 3 life.
Put target creature card from a graveyard onto the battlefield under your control.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
Search your library for a card, exile it face down, then shuffle.
Turn the exiled card face up. If it's a creature card, you lose life equal to its mana value.
You may put the exiled card onto the battlefield if it's a creature card. If you don't put it onto the battlefield, put it into its owner's hand.

Players play a Magic subgame, starting at 1 life and using their libraries as their decks. For the rest of the main game, if a source would deal damage to a player who didn't win the subgame, it deals double that damage to that player instead.

Whenever a player draws their second card during their turn, you draw a card.
Whenever a player casts their second spell during their turn, you create a 2/2 white Knight creature token.

(Transforms from Matzalantli.)
Fathomless descent — : Add X mana of any one color, where X is the number of permanent cards in your graveyard.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
Seek a card with mana value less than the number of cards in your hand.
Seek a card with mana value greater than the number of cards in your hand.
Count the number of cards in your hand. You may cast a spell with mana value equal to that number from your hand without paying its mana cost.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after IV.)
Destroy up to one target nonland permanent.
, Each opponent loses 2 life.
Create Galactus, a legendary 16/16 black Elder Alien creature token with flying, trample, and "Whenever Galactus attacks, destroy target land."

Trample
You may cast creature cards from your hand as though they were the card Colossal Dreadmaw. (They become Colossal Dreadmaws.)

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
Exile target creature card from your graveyard. Create a token that's a copy of it, except it isn't legendary and is a Mutant in addition to its other types.
, Create a token that's a copy of a card exiled with this Saga, except it isn't legendary and is a Mutant in addition to its other types.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
Surveil 3.
When you next cast a creature spell this turn, copy it, except the copy isn't legendary.
Choose a card name. Whenever a creature with the chosen name deals combat damage to a player this turn, draw a card.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
All artifacts and creatures phase out. Create a 0/1 white Human creature token with "Permanents can't phase in."
You draw two cards and each player loses 2 life.
Sacrifice a creature token. If you do, you gain 5 life.

Affinity for Knights
Creatures you control get +1/+1.
Whenever you cast a legendary spell, create a 2/2 white Knight creature token with vigilance.
, : Create a 2/2 white Knight creature token with vigilance.

Flying, haste, protection from red
, : Return target legendary creature card from your graveyard to the battlefield.
Tap six untapped creatures you control: Return The Cinematic Phoenix from your graveyard to the battlefield. If you tapped six legendary creatures this way, you win the game.

Menace
Ferocious — Whenever you attack while you control a creature with power 4 or greater, you draw a card and lose 1 life.

When you planeswalk to The Cheetah Planet and at the beginning of your upkeep, put two +1/+1 counters on target non-Cat creature you control. It becomes a Cat in addition to its other types.

Whenever chaos ensues, all Cats gain provoke until end of turn.

When you control no permanents other than The Cheese Stands Alone and have no cards in hand, you win the game.

Target creature gets +3/+0 and gains first strike until end of turn. Investigate.

, , Exile The Champion : Search your library for a legendary artifact card that isn't a creature card, reveal it, put it onto the battlefield, then shuffle.

At the beginning of your end step, if you didn't activate a loyalty ability of a planeswalker this turn, you lose 2 life.
, : For each planeswalker you control, you may activate one of its loyalty abilities once this turn as though none of its loyalty abilities have been activated this turn.

If it's neither day nor night, it becomes day as The Celestus enters.
: Add one mana of any color.
, : If it's night, it becomes day. Otherwise, it becomes night. Activate only as a sorcery.
Whenever day becomes night or night becomes day, you gain 1 life. You may draw a card. If you do, discard a card.

Whenever The Celestial Toymaker attacks, look at the top three cards of your library. Exile any number of them in a face-down pile and the rest in a face-up pile. Defending player chooses one of those piles. Put that pile into your hand.
At the beginning of each end step, each opponent loses 2 life for each spell or ability that caused one or more players to guess or to group cards or permanents into a pile this turn.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after IV.)
Put two stun counters on each of up to two target tapped creatures.
, For each non-Saga permanent, choose a counter on it. You may put an additional counter of that kind on that permanent.
Search your library for a Doctor card, reveal it, put it into your hand, then shuffle.