msem-instigator

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.”)

Menace, deathtouch
Whenever a creature an opponent controls dies, that player loses 2 life and you gain 2 life.

When Customs Lookout enters, each player draws a card, then discards a card.
Whenever an opponent casts a spell with the same name as a card they own in exile or in their graveyard, you may scry 2.

Whenever Cutthroat Spy deals combat damage to a player, you may draw a card.

Pressure {1}{U} (You may cast this spell for its pressure cost if seven or more cards are in your graveyard.)
When Cuxuri Harbinger enters, draw a card.

Menace
Whenever CySec Blacksuit deals combat damage to a player or planeswalker, create a Function token with “Choose a nonland card exiled by this spell. For as long as that card is exiled, you may cast it and you mana of any type can be spent to cast that spell.” (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)

Flash
When CySec Disruptor enters, if it was cast, target opponent conjures a card named Data-Point on top of their library. (It's a sorcery that costs {2} with “Draw a card.”)

Breach (Whenever this deals combat damage to a player, you may have it become an Aura Curse until your next turn. Attach it to that player.)
Whenever a cursed opponent attacks, you may draw a card.

Flash

Creature spells you cast cost {2} less to cast.
Whenever another nontoken creature you control enters, it becomes a colorless Vehicle artifact with crew 1. (Tap any number of creatures you control with total power 1 or greater: That Vehicle becomes an artifact creature until end of turn.)

When Dabbling Patron enters, if you cast an instant or sorcery spell this turn, create a 1/1 colorless Elemental creature token.

Adorned — Daelish Archer has first strike as long as it's equipped and/or enchanted.

Adorned — Daelish Hopeful has first strike as long as it's equipped and/or enchanted.

Breach (Whenever this deals combat damage to a player, you may have it become an Aura Curse until your next turn. Attach it to that player.)
Whenever you cast a spell, Daemonspawn deals 1 damage to each cursed opponent.

Dafiqi Falconer gets +X/+X, where X is the amount of life you've gained this turn.
As long as your life total is greater than your starting life total, Dafiqi Falconer has flying.

Menace
When Dagger-Thrash Marauders enters, you may have it consume. If you do, put a +1/+1 counter on it and it gains haste until end of turn. (To consume, sacrifice another creature or exile a creature card from your graveyard.)

Ward—Pay 2 life. (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays 2 life.)
You may cast sorcery spells as though they had flash.
Whenever you cast a sorcery spell, Daiju, Lightning-Draw gets +2/+0 and gains first strike until end of turn.

Whenever Daisite Express attacks, draw a card.
Whenever Daisite Express deals combat damage to a player, discard a card.

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Frontiers Anew {G}
Sorcery — Adventure
Search your library for a basic land card, reveal it, put it into your hand, then shuffle. (Then exile this card. You may cast the creature later from exile.)

When Damaris Alfahir enters, for each opponent, put a bribery counter on an artifact or creature that player controls.
At the beginning of your upkeep, gain control of target permanent with a bribery counter on it until end of turn. Untap it. It gains haste until end of turn.

First strike
Noncreature spells cost {1} more to cast as long as their controller is horrific. (A player is horrific as long as they've sacrificed a permanent or discarded a card this turn.)

Reach
When Danaj Decider dies, judge another target creature you control. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

{1}: Danaj Sightseer gains lifelink until end of turn if {W} was spent to activate this ability. The same is true for flying and {U}, menace and {B}, first strike and {R}, and trample and {G}.
At the beginning of your end step, if you've spent {W}{U}{B}{R}{G} to cast spells and/or activate abilities this turn, put three +1/+1 counters on Danaj Sightseer.

{B}, Sacrifice another creature: Exile target card in an opponent's graveyard. You may cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell. Activate only as a sorcery.

Identity — As long as you control at least two other creatures that share a creature type with Danuri Eaglerider, Danuri Eaglerider gets +1/+2 and has flying.