msem-instigator

Whenever you cast a spell from exile, put two +1/+1 counters on Midnight Vagrant. It gains menace until end of turn.
{1}{B}{B}: Exile the top card of target opponent's library. You may play that card during any turn you attacked with a Rogue, and you may spend mana as though it were mana of any color to cast it. Activate only as a sorcery.

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you cast a legendary spell, add a quest counter.
Look at the top seven cards of your library. You may reveal up to two legendary cards from among them and put them into your hand. Put the rest on the bottom of your library in a random order.
You gain 5 life.
Destroy all nonlegendary creatures.

Vigilance
Whenever Mikkino becomes blocked by a creature with power 3 or greater, exile that creature.

Exile target creature. (Then exile this card. You may cast the creature later from exile.)

Equipped creature gets +2/+2 and has ward {2}.
Whenever a creature you control enters, if you cast it from exile, you may attach Minstrel's Armor to it.
Equip {2}

You may have Mirror Mirage enter as a copy of any land on the battlefield, except it's an enchantment in addition to its other types.

Flash
Whenever Mischievous Capuchin or another Monk you control enters, tap target creature you don't control. If it was already tapped, it doesn't untap during its controller's next untap step.

Target creature gets +2/+2 and gains lifelink until end of turn.

Double strike

Deception {U}{B} ({U}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Ms. Moxie deals combat damage to a player, you may exile target nonland card with mana value 2 or less from your graveyard. If you do, cast a copy of that card without paying its mana cost.

Whenever Murkriver Trawler attacks, until end of turn, target Rogue gains “Whenever this creature deals combat damage to a player, draw a card.”

Put a +1/+1 counter on up to one target creature. (Then exile this card. You may play the land later from exile.)

Reveal cards from the top of your library until you reveal a creature card and a land card. Put those cards into your hand and the rest on the bottom of your library in a random order.
Concord — If there are four or more card types among permanents you control, create two Treasure tokens.

(As you complete a condition, decode it. After all are decoded, you solve the mystery and transform it.)
When Mystery of the Dying Herds enters, create a 0/2 white Ox creature token.
A creature you control dies.
You have 4 or more life than your starting life total.

Reverberate {2}{G} (When you cast this spell, copy it if you paid its reverberate cost. The copy becomes a permanent when it resolves.)
Mystical Echo gets +1/+1 for each other Reflection you control.
Whenever you discard a card, Reflections you control gain trample until end of turn.

Naxila, the Blessed City enters tapped.
When Naxila, the Blessed City enters, you gain 2 life and draw two cards.
{T}: Add {C}{C}.

[+1]: Target opponent reveals their hand. Exile a nonland card from it. For as long as it remains exiled, its controller may cast that card, and it costs {2} more to cast.
[–2]: Exile target creature or planeswalker with mana value 3 or less.
[–8]: Search target opponent's library for up to twenty cards and exile them. Then that player shuffles.

Nestled Delta enters tapped unless you control another Desert.
{T}: Add {G} or {U}.

Create a 1/1 white and black Badger Cleric creature token with lifelink. (Then exile this card. You may cast the creature later from exile.)

Nimblefoot can't be blocked.

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.

Whenever No-Good Gunpointer attacks, you may pay 3 life. If you do, draw a card.

Other creatures you control get +1/+1.
As long as Nobility is in your graveyard and you control a white enchantment, creatures you control get +1/+1.

As long as it's not your turn, Northrime Amalgam gets -2/+2.

Northrime Aurora enters tapped unless you played it from exile.
{T}: Add {G} or {U}.