msem-instigator

Schoolmaster gets +1/+1 for each other Merfolk you control.
When Schoolmaster enters, create a 1/1 white Merfolk creature token.

When Solar Wisp enters, put a +1/+1 counter on target creature.

When Teikoku Songcrafter enters, create a 2/2 colorless Spirit creature token.
Whenever a colorless creature you control enters, put a +1/+1 counter on it.

{3}{W}: Exile Vanishing Memory and target creature an opponent controls.

Whenever a creature you control dies, you may pay {W}. If you do, you get a glory counter. (You lose glory counters before life. A player with ten or more glory counters wins the game.)
{2}{W}, {T}: Return target creature card from your graveyard to the battlefield. Activate this ability only if you are glorious.

Knight spells you cast cost {1} less to cast.

Eureka! (At the beginning of each end step, you get a research counter if you cast a spell this turn. Then if you have eight or more research counters, remove them and create a Masterpiece token of your choice.)
{T}: Draw a card, then discard a card.

When Debt Dignitary enters, tap target nonland permanent. That permanent doesn't untap during its controller's untap step for as long as you control Debt Dignitary.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
When Determined Koi has three or more +1/+1 counters on it, remove them all and transform it.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When Hinasa Mystic enters, draw a card.

{T}: Scry 1.
{1}{U}, {T}: Reveal the bottom card of your library. If it's an artifact or enchantment card, put it into your hand.

When Seishin Tidekeeper enters, create a 2/2 colorless Spirit creature token.
Colorless creatures you control have flying.

Whenever an artifact is put into your graveyard from the battlefield, you may draw a card. If you do, discard a card.
{T}, Exile three noncreature cards from your graveyard: Create a 1/1 colorless Construct artifact creature token.

When Silvercrest Vanguard enters, scry 1, then draw a card.
Whenever you draw your second card each turn, put a +1/+1 counter on Silvercrest Vanguard.

Whenever Blood Artist or another creature dies, target player loses 1 life and you gain 1 life.

When Bloodbriar Acolyte dies, draw a card. Each opponent loses 1 life.

{B}, {T}, Pay 1 life, Discard a card, Sacrifice Dark Rite Cultist and another creature: Create a 5/5 black Demon creature token with flying.

When Distant Lover enters, create a 1/1 colorless Citizen creature token.

When Sasori Nightrunner enters, create a 2/2 colorless Spirit creature token.
Whenever a colorless creature you control dies, each opponent loses 1 life.

Whenever a creature you control dies, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)
Whenever you sacrifice a noncreature permanent, each opponent loses 1 life and you gain 1 life.

At the beginning of combat on your turn, tap Tinchor, put two +1/+1 counters on him, you draw a card, and you lose 1 life.
When Tinchor dies, put his counters on target Human you control.

When Withering Beggar dies, you may put a -1/-1 counter on target creature.

Haste
Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)

Haste
{T}, Sacrifice a creature: Ashspeaker deals 1 damage to any target.

Flying, double strike
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)