Isis

Necrosynthesis

Enchant creature
Enchanted creature has "Whenever another creature dies, put a +1/+1 counter on this creature."
When enchanted creature dies, look at the top X cards of your library, where X is its power. Put one of those cards into your hand and the rest on the bottom of your library in a random order.

A small shock to save a life, a large one to take it away.
—Mardu healer's adage

Defibrillating Current

Defibrillating Current deals 4 damage to target creature or planeswalker and you gain 2 life.

"Defy me, and you will dissolve inch by screaming inch."

Rot Like the Scum You Are

When you set this scheme in motion, create a 2/2 green Ooze creature token, then put a number of +1/+1 counters on it equal to the number of lands your opponents control.

Enduring Tenacity

Whenever you gain life, target opponent loses that much life.
When Enduring Tenacity dies, if it was a creature, return it to the battlefield under its owner's control. It's an enchantment. (It's not a creature.)

Flare of Duplication // Flare of Duplication

Flare of Duplication

You may sacrifice a nontoken red creature rather than pay this spell's mana cost.
Copy target instant or sorcery spell. You may choose new targets for the copy.

Echoes of Eternity

If a triggered ability of a colorless spell you control or another colorless permanent you control triggers, that ability triggers an additional time.
Whenever you cast a colorless spell, copy it. You may choose new targets for the copy. (A copy of a permanent spell becomes a token.)

Laughter and conversation trailed off as the revelers gathered around Zegana's body. Three things quickly became clear: it was a murder, the killer was likely among them, and Teysa's party was definitely over.

Murder

"It is technically an ooze, but its lifespan measures only seconds. In that short time, its appetite for magic is extraordinary."
—Simic research notes

Voidslime

Counter target spell, activated ability, or triggered ability. (Mana abilities can't be targeted.)

The Izzet specialize in unnatural disaster.

Cyclonic Rift

Return target nonland permanent you don't control to its owner's hand.
Overload {6}{U} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

Niv-Mizzet, Supreme

Flying, hexproof from monocolored
Each instant and sorcery card in your graveyard that's exactly two colors has jump-start. (You may cast that card from your graveyard by discarding a card in addition to paying its other costs. Then exile it.)

On Amonkhet, Phyrexia found a ready-made army of horrors waiting for a new master.

Unseal the Necropolis

Each player mills three cards. Then you return up to two creature cards from your graveyard to your hand. (To mill three cards, a player puts the top three cards of their library into their graveyard.)

"Deploy the blightwidows. Rankle's pests should make for a delicious meal."
—Ayara, Furnace Queen

Arachnoid Adaptation

Target creature gets +2/+2 and gains reach until end of turn. Untap it.

Free from Flesh // Free from Flesh

He finally understood that phyresis was not an ending, but a new, perfect beginning.

Free from Flesh

Target creature gets +2/+2 until end of turn. Put two oil counters on it.

Psychosis Crawler // Psychosis Crawler

"Perhaps drawing the impossible monster will lessen the burden my memory must bear."
—Jarsyl, diary

Psychosis Crawler

Psychosis Crawler's power and toughness are each equal to the number of cards in your hand.
Whenever you draw a card, each opponent loses 1 life.

"My dreams have brought more visions from our master: an altar, exquisite and perfect. We must build it at once."
—Writings of Artonac, priest of Gix

Altar of Dementia

Sacrifice a creature: Target player mills cards equal to the sacrificed creature's power.

"It's frustrating, isn't it, to be so weak and ineffectual? Don't worry, you'll be *compleat* soon enough."
—Rona

Negate

Myrkul, Lord of Bones // Myrkul, Lord of Bones

Myrkul, Lord of Bones

As long as your life total is less than or equal to half your starting life total, Myrkul has indestructible.
Whenever another nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of that card, except it's an enchantment and loses all other card types.

Hostile Takeover

Up to one target creature has base power and toughness 1/1 until end of turn. Up to one other target creature has base power and toughness 4/4 until end of turn. Then Hostile Takeover deals 3 damage to each creature.

Hidetsugu, Devouring Chaos

{B}, Sacrifice a creature: Scry 2.
{2}{R}, {T}: Exile the top card of your library. You may play that card this turn. When you exile a nonland card this way, Hidetsugu deals damage equal to the exiled card's mana value to any target.

Gift of Wrath // Gift of Wrath

Gift of Wrath

Enchant artifact or creature
As long as enchanted permanent is a creature, it gets +2/+2 and has menace. (It can't be blocked except by two or more creatures.)
When this Aura leaves the battlefield, create a 2/2 red Spirit creature token with menace.

Wickerwing Effigy

Defender
You may look at the top card of your library any time.
You may cast creature spells from the top of your library.
Whenever you cast a creature spell from your library, it becomes a black Bird in addition to its other colors and types, has flying, and has base power and toughness 1/1.

Arvinox, the Mind Flail

Arvinox isn't a creature unless you control three or more permanents you don't own.
At the beginning of your end step, exile the bottom card of each opponent's library face down. For as long as those cards remain exiled, you may look at them, you may cast permanent spells from among them, and you may spend mana as though it were mana of any color to cast those spells.