msem-instigator

Enchant player
When Curse of Grasping Air enters the battlefield, enchanted player reveals their hand. You choose a nonland card from it. That player discards that card.
Spells you cast that target enchanted player cost {1} less to cast.

Enchant player
When Curse of Life's Cycles enters the battlefield, destroy target creature enchanted player controls.
Concord — At the beginning of enchanted player's upkeep, if there are four or more card types among permanents you control, that player loses 1 life and you gain 1 life.

Target opponent sacrifices a creature with the greatest power among creatures that player controls.
Fabled {3}{B}{B} (Then if you cast this for its fabled cost, put it onto the battlefield transformed attached to that player.)

Enchant player
At the beginning of enchanted player's upkeep, that player upgrades a creature you control. (They give it one of the listed counters it doesn't have.)
• +1/+1
• Lifelink
• Menace

When Deadly Harpoon enters the battlefield, destroy up to one target creature or planeswalker.
Equipped creature gets +2/+0.
Equip {2}

Whenever a creature you control deals combat damage to a player, it cackles. (Put a menace counter on it. If it already has menace, it deals 1 damage to each opponent instead.)
{3}{B}: Each creature you control with menace gains lifelink until end of turn.

Deathtouch
When Deathbed Confessor enters the battlefield, if it entered from a graveyard or you cast it from a graveyard, you draw two cards and you lose 2 life.

Enchant creature
Enchanted creature gets -3/-3.
Revive {6}{B} ({6}{B}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

You draw X cards and you lose X life, where X is the number of different names among land cards in your graveyard.

Mill four cards. You may put up to two cards from among the milled cards into your hand. Each player loses 2 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 Grinning Torturer deals combat damage to a player, torment that player. (They lose 3 life unless they discard a card or sacrifice a nonland permanent.)

When Harpooned Bubbledomer enters the battlefield, mill four cards.
Harpooned Bubbledomer gets +2/+0 and has menace as long as there are four or more card types among cards in your graveyard.

When Harvest Blighter enters the battlefield, create a black Aura Curse enchantment token named Rotting Away attached to target player. The token has enchant player and “Whenever a creature enters the battlefield under enchanted player's control, if it has toughness 2 or greater, put a -1/-1 counter on that creature.”

When Helicos-Drowned Captain enters the battlefield, create a black Aura Curse enchantment token named Marked for Death attached to target player. The token has enchant player and “At the beginning of enchanted player's upkeep, that player loses 1 life.”

Each other Okus planeswalker you control enters the battlefield with two additional loyalty counters on it.
[–2]: Each opponent discards a card and loses 2 life.

Return target creature card from your graveyard to your hand. Catalyze. (The next spell you cast this turn costs {1} less to cast.)
Flashback {3}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Menace
Vanguard — Whenever a creature you control attacks alone, it gets +1/+1 until end of turn for each creature card in your graveyard.

Engorge (As this enters the battlefield, mill three cards, then exile a card from among the milled cards.)
Whenever an instant or sorcery card you own is exiled from anywhere, you gain 1 life.

Alpha (You may have this creature enter the battlefield with a +1/+1 counter on it. If you do, it becomes alpha and can only attack alone.)
Lifelink
When Leyran-Pack Outcast attacks, if it's alpha, each player sacrifices a creature.

Create a tapped Treasure token.
Memento {2}{B}{B} (You may cast this from your graveyard for {2}{B}{B}. If you do, put it onto the battlefield transformed after it resolves. Exile it if it would leave the battlefield or not resolve.)

Flying
Once during each of your turns, whenever you cast a spell from your graveyard, you may draw a card and create a tapped Treasure token.

Glitch—Pay 3 life. (Remove one [restriction] for each time you pay the glitch cost.)
Create a 6/6 black Demon artifact creature token with flying, trample, [“This creature can't attack players with 10 or more life,”] [and “This creature can't block creatures with power 4 or less.”]

Deathtouch
Whenever you lose life, you may cast target black noncreature card in your graveyard this turn. If it would be put into a graveyard from anywhere this turn, exile it instead.
Whenever you gain life for the first time each turn, create a 1/1 black Actor creature token.

(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.

Deception {B} ({B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Lifelink
{1}{B}: Nimunotian Shadow gets +1/+1 until end of turn.