msem-instigator

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you put one or more +1/+1 counters on a creature, add a quest counter.
1, 2 — Create two 1/1 green and white Mouse Soldier creature tokens with vigilance.
3 — Until end of turn, creatures you control get +1/+1 and gain lifelink.

Lifelink
Whenever Repent, Daughter of Fallacy blocks or becomes blocked, it deals 3 damage to any target.

Exchange control of two target creatures. If an opponent gained control of a Monk you controlled this way, return that creature to its owner's hand.

(Activate each submodule once as a sorcery. When this enters, activate one submodule for free.)
{4}{G}: Recreate
Put two +1/+1 counters on each creature token you control.
{4}{U}: Reproduce
Draw a card for each noncreature token you control.
{3}{G}{U}: Repeat
Replication Module gains “At the beginning of your upkeep, you may create a token that's a copy of target token you control.”

Flash (You may cast this spell any time you could cast an instant.)
When Replicator Mage enters, you may create a token that's a copy of target creature that's attacking you. Exile that token at end of combat.

Until end of turn, target creature loses all abilities and has base power and toughness 1/1. Scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

Return target creature card from your graveyard to the battlefield. It has base power and toughness 1/1 and is a Construct in addition to its other types. (This effect lasts indefinitely.)
Compose (Then if you cast this from your hand, exile it and create a Saga token with “r3—You may cast a copy of this card from exile without paying its mana cost.”)

When Repurposed Custodian enters, shuffle any number of target cards from graveyards into their owner's libraries.

Whenever a creature you control dies, you may search your library for an enchantment card or a card with fabled, reveal it, put it into your hand, then shuffle.

Wanderlust — When you cast this spell, you may copy it if you control four or more differently named lands.
Look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in a random order.

Exile the top two cards of your library. Until end of turn, you may play those cards. Add {R} for each creature card exiled this way.

Each opponent mills half their library, rounded up. When they do, return target creature card from a graveyard to the battlefield under your control.

Whenever a land you control enters, you may sacrifice a creature. If you do, each opponent sacrifices a creature.
{2}{B}{G}, Sacrifice a land: Draw a card.

Return target creature or planeswalker card from your graveyard to the battlefield.
Flashback—{1}{B}{B}, Sacrifice a creature or a planeswalker. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

This spell costs {2} less to cast as long as you've sacrificed an Idol this turn.

Trample
When Resolution of Stone enters, put a +1/+1 counter on target creature you control.
Revive {4}{G}{G} ({4}{G}{G}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Creatures you control get +2/+1 until end of turn.
Cycling {1}{W} ({1}{W}, Discard this card: Draw a card.)

You may cast this spell as though it had flash if you pay an additional {2} to cast it.
You may have Resourceful Impersonator enter as a copy of any creature on the battlefield.

When Resting Tombs enters, exile target creature an opponent controls until this enchantment leaves the battlefield.
If a creature would die, exile it instead.
{3}{B}{B}: Exile all creature cards from all graveyards. Transform Resting Tombs. Activate only as a sorcery.

When Restless Explorer enters, search your library for a land card, reveal it, put it into your hand, then shuffle.

Bleed {2}{R}{R} (You may cast this spell for its bleed cost if an opponent has lost life this turn.)
When Restless Hedonist enters, discard your hand, then draw three cards.

Whenever you sacrifice a permanent, put a +1/+1 counter on Restless Oppressor.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
Whenever a card leaves your graveyard, you gain 1 life.
I, II — Return target land card from your graveyard to the battlefield.
III — Return any number of creature and/or land cards from your graveyard to your hand. Exile Restoration.

Return target creature card with mana value 3 or less from your graveyard to the battlefield. You gain 3 life.