msem-instigator

[+1]: Create a 1/1 colorless Elemental creature token. Put a loyalty counter on each planeswalker you control.
[+1]: Untap up to two target permanents.
[–7]: You get an emblem with “Whenever you create a token, draw a card.” Create three 4/4 green Chimera creature tokens.

Whenever a creature enters without counters during your next turn, you may put two +1/+1 counters on it. (Then exile this card. You may cast the creature later from exile.)

Gain control of target nonland permanent. The player that controlled it creates a 3/3 blue Squid creature token.

You may exile cards you own as you reveal them. (You see the card before you exile it.)
During each of your turns, you may cast a card exiled with Starwing Nebula.

Enchant creature
When Strength in Imagining enters, if it enchants a face-down creature, put a +1/+1 counter on that creature.
Enchanted creature has flying and trample.

[+1]: Scry 1. Untap up to one target creature.
[–2]: Mill a card for each card type among permanents you control, then you may return a land card and/or a nonland card milled this way to their owner's hand.
[–6]: Until end of turn, you may cast spells from your hand and graveyard without paying their mana costs. If a card would be put into your graveyard from anywhere this turn, exile it instead.

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you draw your second card each turn, add a quest counter.
1, 2 — Scry 3.
3 — Create a blue and green enchantment token named The Heart with “Whenever you tap a land for mana, add one mana of any color.”

Whenever The Pursuit of Science enters or a nontoken creature you control dies, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)
Clues you control have “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Distribute a trample counter, a vigilance counter and a +1/+1 counter among one, two, or three creatures you control.
III — Choose another permanent you control. For each counter on it, you may move that counter onto a permanent you control.
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Search your library for two basic land cards that don't share a land type and put them onto the battlefield tapped.
{W}{U}{B}{R}{G}, Exile The World Follows After from your graveyard: Create a 4/4 Elemental creature token that's all colors. It can't block this turn.

If you would put one or more counters on a creature you control or on yourself, put that many plus one of each of those kinds of counters on that creature or player instead.
{2}{G}{U}, Sacrifice Triton's Invocation: Draw cards equal to the greatest number of counters among creatures you control and yourself.

Shuffle any number of cards from your graveyard into your library. You gain that much life.
Draw a card.

Target player shuffles any number of target cards from their graveyard into their library.
Draw a card.

Whenever a creature is returned to your hand, scry 1.
{4}{G}{U}: Reveal the top card of your library. If it's a permanent card, you may put it onto the battlefield.

Create three 1/1 black Insect creature tokens with flying, then judge each of them. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

[+1]: Scry 2. Create a 1/1 black Insect creature token with flying.
[–2]: Judge each creature you control. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)
[–8]: For each card type, search your library and graveyard for a card of that type and exile it, then shuffle. You may play any number of cards exiled this way without paying their mana costs.

Whenever one or more creatures an opponent controls attack you or a planeswalker you control, that player gets a poison counter.

Choose two or four —
• Return target nonland permanent to its owner's hand.
• Each player sacrifices a creature.
• Each player sacrifices a noncreature, nonland permanent.
• Conjure a card named Fatigue and put it on top of your library. (It's a colorless sorcery that costs {2} with “Draw a card.”)

Archive 4 (As this enters, shuffle the top four cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
At the beginning of each opponent's upkeep, that player may pay 2 life. If they do, you gain 2 life. Otherwise, you draw a card from the archived library.

Choose two —
• Exile target spell.
• Target player may scry 2. If they do, they draw a card.
• Return target artifact card from your graveyard to the battlefield.
• Destroy target nonartifact creature.

Enchant creature
You control enchanted creature.
Enchanted creature gets +1/+1 and is an artifact in addition to its other types.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Exile up to one target creature you control. At the beginning of your next end step, return it to the battlefield.
III — Until end of turn, if a creature entering the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.
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Surveil 3. Then you gain 3 life and draw three cards. (To surveil 3, look at the top three cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
Cycling {2} ({2}, Discard this card: Draw a card.)

Destroy all creatures, then return all nonland permanents to their owner's hands.

This spell can't be countered.
Exile your library, then shuffle Revisionary Studies, your graveyard, and your hand into your library. Draw five cards.