msem-instigator

When Ginjiro Chimei enters the battlefield, you may search your library for a card with an activated ability, put it into your graveyard, then shuffle.
You may cast Ginjiro Chimei from your graveyard by paying 2 life in addition to paying its other costs.

Whenever a creature dies, exile it.
Hiroto Jaakuna has all activated abilities of creature cards exiled with Hiroto Jaakuna.

If a permanent with spirited entering the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

When Indomitable Duo enters the battlefield, choose up to two creature card names.
Whenever Indomitable Duo attacks, put a +1/+1 counter on each creature you control with a name chosen by Indomitable Duo.

Spirited (When this creature enters the battlefield, you may activate one of its activated abilities without paying its cost.)
{1}, {T}: Choose a nonland card name. Reveal the top three cards of your library and put each revealed card with that name into your hand. Put the rest into your graveyard.

Spirited (When this creature enters the battlefield, you may activate one of its activated abilities without paying its cost.)
{3}{W}{B}: Create a 0/1 white and black Human Advisor creature token with “When this creature enters the battlefield, target creature can't attack or block until this creature leaves the battlefield.”

Flash
Spirited (When this creature enters the battlefield, you may activate one of its activated abilities without paying its cost.)
{W}{B}: Kirishima's Escort gets +1/+1 and gains first strike until end of turn.

Flash
Spirited (When this creature enters the battlefield, you may activate one of its activated abilities without paying its cost.)
{1}: Remove target attacking creature you control from combat and untap it.

Whenever you activate an ability of a creature that isn't a mana ability, Moranai Tracker gets +1/+1 until end of turn.

At the beginning of your upkeep, if Nightmare Riders is in your graveyard, you may mill two cards.

Whenever you cast an instant or sorcery spell from your hand, you may cast target card with the same name as that spell from your graveyard. (You still pay its costs.)

Exile the top card of your library, a card from your hand and a card from your graveyard. Put one of the exiled cards on top of your library, one into your hand, and the other into your graveyard.

Whenever Shina Taiyohata or another creature enters the battlefield under your control, you may have that creature gain haste. If you do, return that creature from the battlefield to its owner's hand at the beginning of the next end step.

Draw two cards, then discard a card.
Whenever you cast an instant or sorcery spell, if Spirit Script is in your graveyard, you may have it become a copy of that spell until end of turn.

Spirited (When this creature enters the battlefield, you may activate one of its activated abilities without paying its cost.)
{3}{R}{W}: Creatures you control gain flying and haste until end of turn.

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.)
Pay 1 life, Choose a creature card name you haven't chosen for Suzume Oshiruko this turn: Return another creature you control with the chosen name to its owner's hand.

Each other Rogue creature you control enters the battlefield with an additional +1/+1 counter on it.
Remove a +1/+1 counter from a creature you control: That creature can't be blocked this turn.

Spirited (When this enters the battlefield, you may activate one of its activated abilities without paying its cost.)
Equipped creature gets +3/+2.
Equip {2}

Spirited (When this enters the battlefield, you may activate one of its activated abilities without paying its cost.)
{1}, {T}: Add one mana of any color. When you do, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Spirited (When this enters the battlefield, you may activate one of its activated abilities without paying its cost.)
{3}, {T}: Create a colorless Equipment artifact token with “Equipped creature gets +1/+1” and equip {1}. Attach that token to a creature you control.

Spirited (When this enters the battlefield, you may activate one of its activated abilities without paying its cost.)
{2}, Sacrifice Imperial Silks: Draw a card.
{2}, Sacrifice Imperial Silks: You gain 3 life.

Equipped creature gets +0/+3.
Whenever equipped creature dies, draw a card.
Equip {3}

Equipped creature gets +1/+1.
Equipped creature has “When this creature dies, if it's not a token, create a token that's a copy of it except it's a colorless Spirit Dragon with flying in addition to its other abilities.”
Equip {2}

Once each turn, when another permanent enters the battlefield under your control, you may create a token that's a copy of that permanent, except it has no mana cost.

Activated abilities of cards in your graveyard cost {2} less to activate.