msem-instigator

When Pale Night Remnants enters, return up to one target nonland permanent and all other permanents with the same name as that permanent to their owners' hands.

When you unveil Shining Elementalist, creatures can't block this turn.

Elemental, Demon, and Spirit spells you cast cost {1} less to cast.
Whenever you cast a Elemental, Demon, or Spirit spell, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Target creature gains double strike and trample until end of turn. (Then exile this card. You may cast the creature later from exile.)

Whenever you cast an instant or sorcery spell from exile, copy it. You may choose new targets for the copy.

Exile the top two cards of your library. Until your next end step, you may play those cards.
Whenever you cast your third spell each turn, you may exile Devoted Artistry from your graveyard. If you do, you may cast a copy of it at the beginning of your next upkeep. (You still pay its costs.)

When Karoa's Faithful enters, target creature gets +X/+X until end of turn, where X is the total number of creatures you control that are Knights or have Adventures.

[+1]: Create a 1/1 colorless Thopter artifact creature token with flying. It gains lifelink until your next turn.
[–1]: Sacrifice an artifact. If you do, draw two cards.
[–6]: Draw seven cards. Artifact spells you cast this turn cost {2} less to cast.

First strike
As long as it's your turn, other creatures you control get +1/+0.

Whenever you attack, you may double target attacking creature's power. If you do, sacrifice it at the beginning of the next step.
Whenever one or more red creatures you control enter, creatures you control get +1/+0 and gain trample until end of turn.

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you attack, add a quest counter.
1, 2 — Mill a card, then create a 1/1 black Peasant creature token.
3 — Each player sacrifices a creature.
Monument {2}{B}{B} (You may cast this transformed from your graveyard for its monument cost. Exile it if it would leave the battlefield or not resolve.)

When Bloodsoaked Blades enters, creatures you control get +2/+0 until end of turn.
Equipped creature gets +1/+1.
Equip {1}

Discard your hand, shuffle your library, then draw three cards. You may cast a nonland card from your hand without paying its mana cost.
Acquiesce (If you cast this spell from your hand, exile it as it resolves. When one or more creatures you control deal combat damage to an opponent, you may cast this card from exile without paying its mana cost.)

Flying, trample
When Ashen Persecutor enters, target opponent reveals their hand. You choose a nonland card from it. That player discards that card and you gain life equal to its mana value.

Ward—Exile three cards from your graveyard. (Whenever this permanent becomes the target of a spell or ability an opponent controls, counter it unless that player exiles three cards from their graveyard.)
Menagerie — Astralhorn Familiar gets +2/+2 as long as there are five or more creature types among creatures you control.

When Chamber of Reflections enters, draw a card, then choose a legendary card name.
Permanents you control with the chosen name have hexproof and the “legend rule” doesn't apply to them.

Faradia's Favored attacks each combat if able.
Whenever you pay a tithe, you may return Faradia's Favored from your graveyard to the battlefield.

All creatures get -1/-1 until end of turn.
If ten or more cards are in your graveyard, creatures your opponents control get an additional -1/-1 until end of turn.

Haste
When Bloodfury Warlord enters or dies, it deals 2 damage to each player.

When Herald of Darkness enters, destroy up to one target creature with mana value 3 or less.

Put target creature on top of its owner's library. All other creatures that player controls get -2/-2 until end of turn.

When Army Guide dies, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
{2}{G}{W}, Sacrifice Army Guide: Exile target noncreature, nonland permanent. Activate only as a sorcery.

As an additional cost to cast this spell, sacrifice a permanent.
Return up to two target cards from your graveyard to your hand. Exile Lu'She Temple Customs.

Surveil 2. When you do, destroy up to one target creature with power less than or equal to the number of card types among cards in your graveyard.

Whenever Search the Shadows or a nontoken Ninja or Rogue you control enters, create a 1/1 blue Ninja creature token with “This creature can't be blocked.”
Whenever one or more Ninja and/or Rogue creatures you control deal combat damage to a player, draw a card.