msem-instigator

When Loyal Retriever dies, search your library for an Aura or Equipment card, reveal it, put it into your hand, then shuffle.
Foreshadow {5}{W} (You may cast this spell for its foreshadow cost. If you do, also trigger its “dies” abilities when it enters.)

Paranoia—Reappropriate white. (You may cast this spell by exiling two white cards from your hand and/or graveyard when a permanent you control leaves the battlefield.)
When Ivenge's Evangel enters, create a 1/1 white Cleric creature token and you gain 1 life.

Golden age (If you cast an instant or sorcery spell, activated a nonmana ability, and attacked this turn, enter a renaissance for this game.)
Target creature has base power and toughness 4/4 until end of turn. If you're in a renaissance, untap it and it gains hexproof and indestructible until end of turn.

Flying, vigilance
Augmented — When Antigravity Agent enters, if you've spent {W}{U}{R}{B}{G} to cast spells this turn, distribute a flying counter and a vigilance counter among one or two creatures you control.

{T}: Add {G}. If you control an attacking creature, add one mana of any color instead.

Choose three. You may choose the same mode more than once.
• Each opponent sacrifices a creature.
• Each opponent loses 2 life and you gain 2 life.
• Choose a player and look at their hand. Choose a nonland card from among them. They discard it.

{T}: Add {C}.
{T}, Pay 1 life: Add {W} or {U}.

Haste
At the beginning of your end step, sacrifice Breach Runner unless you return another creature you control to its owner's hand.

When Recursion Runner enters, create a Function token with “If this spell isn't a copy, copy it. You may choose new targets for the copy.” (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)

Flying

When Blighting Ooze enters, put a -1/-1 counter on each of up to X target creatures.
As long as Blighting Ooze is on the battlefield, it has all activated abilities of each creature with a -1/-1 counter on it.

Menace

As long as you control another white creature, Mavisa's Familar has lifelink. The same is true for blue and flying, black and deathtouch, and red and trample.

First strike
Whenever an opponent casts a spell, Kiboshi's Guardian gains indestructible until end of turn.

Emissary of Dai Gui enters tapped.
Emissary of Dai Gui doesn't untap during your untap step unless it's in a pack. (Two or more creatures you control with equal power are in a pack.)
Creature spells you cast cost {1} less to cast.

Walker of the Final Path gets +3/+3 and has trample as long as you control a Horror.
When Walker of the Final Path enters, search your library for a Revelation card, put it into your graveyard, then shuffle.

Lifelink
When this creature enters, it seeks secrets. (Give it that Oath Aura. Fulfill it by attacking with it and two or more other creatures to draw a card.)

Flying, trample
When this creature transforms into Griselbrand, the Usurper, draw seven cards.

Exile target creature. Return that card to the battlefield under its owner's control at the beginning of the next end step.

Reach
Whenever a lore counter is put on a Saga you control, Kwende Peak Sentry deals 1 damage to each opponent.

Flying, haste
Dominance — At the beginning of combat on your turn, if you control the creature with the greatest power or tied for the greatest power, you may pay {1}{R}. If you do, return Issbarren Phoenix from your graveyard to the battlefield.

Reach
At the beginning of your end step, if you created one or more creature tokens this turn, create a 1/2 green Spider creature token with reach.

Whenever you cast a spell during an opponent's turn, put a +1/+1 counter on Champion of the Fae.

As Nimble Sandstorm enters, choose speed or power.
At the beginning of combat on your turn,
• Speed — Target creature gains haste until end of turn.
• Power — Target creature gets +2/+0 until end of turn.

{T}, Exile a card from your graveyard: Scry 1.