msem-instigator

Whenever Abyssal Stalker attacks, defending player discards a card at random.
When Abyssal Stalker dies, you may choose a creature. If you do, exile Abyssal Stalker. When the chosen creature leaves the battlefield, return Abyssal Stalker from exile to the battlefield tapped.

If a nontoken creature you don't control would die, exile it instead.
Once each turn, you may cast a card exiled with Accursed Existence.

{T}, Pay 1 life: Surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)
At the beginning of your end step, if your life total is less than 5, sacrifice Achet-Aton's Vizier. If you do, create a 4/4 black Demon creature token with flying.

Menace (This creature can't be blocked except by two or more creatures.)
When Achet-Aton, Living God enters, if your life total is less than 5, your life total becomes 5.
As long as you have 5 or more life, damage that would reduce your life total to less than 5 reduces it to 5 instead.

As an additional cost to cast Acid Sewage, reappropriate or pay {3}. (To reappropriate, exile exactly two cards from your hand and/or graveyard.)
Destroy target creature.

When Acolyte of Night dies, each opponent loses 1 life.

Death knell — Each opponent loses 1 life. You gain life equal to the amount of life lost this way. (As a creature you control dies, trigger one death knell of that creature or another permanent you control.)
Whenever a creature dies, trigger a death knell of a permanent you control.

Lifelink
{2}, Remove two counters from Acrimony: Each opponent loses 2 life and you gain 2 life.
At the beginning of your end step, for each permanent, move a counter from that permanent onto Acrimony.

Flash
Flying, first strike, lifelink

At the beginning of your upkeep, if you control four or more Swamps, you may exile target creature card from your graveyard. If you do, create a tapped token that's a copy of it except it's a black Mummy.

Lifelink
When Adept of Transfusions enters, create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)
Tokens you control have “{1}, {T}, Discard a card, Sacrifice this token: Draw a card.”

As an additional cost to cast this spell, exile two permanent cards from your graveyard.
You may cast Adiran Survivors from your graveyard.

Menace
Whenever a creature an opponent controls dies, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

Civilized — Adorned Naga gets +2/+0 and has menace as long as you control an artifact, a creature, and an enchantment.

Spells you cast from anywhere other than your hand cost {1} less to cast.
Whenever an opponent casts a spell with the same name as a card they own in exile or in their graveyard, that player loses 1 life and you gain 1 life.

Remove all counters from all permanents and exile all tokens.

Return up to one target creature or planeswalker card from your graveyard to your hand. Each opponent loses 3 life and you gain 3 life.

Deception {2}{B} ({2}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Agent of Long Shadows deals combat damage to a player, you may put a Rogue card from your hand or graveyard onto the battlefield.

As an additional cost to cast this spell, sacrifice a creature.
Torment target player three times. (They lose 3 life unless they discard a card or sacrifice a nonland permanent.)

Agonizing Syphon deals 3 damage to any target and you gain 3 life.

Deception {1}{B}
When Aguri, Shadow of Doubt enters, target player reveals their hand. You choose a nonland card from it. That player discards that card. You lose 2 life.

Choose one—
• Target creature gets -3/-3 until end of turn.
• All creatures get -1/-1 until end of turn.

Deathtouch
When Aldrane's Masterpiece enters, look at the top six cards of your library. You may put a Zombie card with lesser mana value from among them onto the battlefield. Put the rest on the bottom of your library in a random order.
Other Zombies you control get +1/+1.

{2}{B}, {T}, Discard a card: Create a 2/2 black Zombie creature token. If a noncreature card was discarded this way, that token enters tapped.

When Alenian Cruel-Star enters, put a +1/+1 counter on it if you control another Goblin.