msem-instigator

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Audition for red. (Create a 1/1 Construct Actor creature token, a Warrior Role giving 3/2 and trample, or a Wizard Role giving 2/2 and prowess. Roles replace older ones.)
III — Whenever a creature you control deals damage to an opponent this turn, exile the top card of your library. You may play it this turn.
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Flying, lifelink
If an ability of an enchantment you control triggers, you may have that ability trigger an additional time.

[0]: Choose up to one target creature. You may put two +1/+1 counters on it, a +1/+1 counter on it and a loyalty counter on Aoia, Monarch of Beauty, or two loyalty counters on Aoia.
[–2]: Exile target creature, then return it to the battlefield. For each kind of counter on it before it left, put that many of that kind of counter on it.
[–9]: You get an emblem with “If an effect would put one or more counters on a permanent you control, it puts five times that many of those counters on that permanent instead.”
Aoia can be your commander.

Target creature you control deals damage equal to its power to target creature or planeswalker you don't control.
Compose (Then if you cast this from your hand, exile it and create a Saga token with “III—You may cast a copy of this card from exile without paying its mana cost.”)

Whenever Apprehensive ‘Slinger deals combat damage to a player or planeswalker, you may discard a card. If you do, draw a card.

This spell costs {1} less to cast for each enchantment you control.
Flying, lifelink, trample
Disturb {6}{B}{B}. That spell costs {1} less to cast for each enchantment you control. (You may cast this card from your graveyard transformed for its disturb cost.)

Prowess
When Arms Tinkerer enters the battlefield, choose one —
• Destroy target artifact.
• Create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Exile each player's graveyard. Create a token that's a copy of a creature card exiled this way.
III — Create a token that's a copy of an artifact or enchantment card exiled with Around the Plane in Three Days.
Create a token that's a copy of a land or planeswalker card exiled with Around the Plane in Three Days.

Enchant land
When Arrive, Surrounded by Petals enters the battlefield, audition for green. (Create a 1/1 Construct Actor creature token, a Scout Role giving 2/3 and vigilance, or a Warrior Role giving 3/2 and trample. Roles replace older ones.)
Enchanted land has “{T}: Add one mana of any color.”

Once during each of your turns, when a card is put into a graveyard from anywhere, you may cast it. You may spend mana of any color to cast that spell.
When Arroyo, Infinitely Branching is put into your graveyard from anywhere, you may cast it.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — You may sacrifice a permanent. When you do, As the Lanterns Float On deals 3 damage to any target.
II — You may sacrifice a permanent. When you do, exile the top two cards of your library. You may play them this turn.
III — Create a token that's a copy of target permanent card in your graveyard with mana value 4 or less. It gains haste. Sacrifice it at the beginning of the next end step.

Create three 1/1 colorless Construct Actor creature tokens.

When Astute Sceneweaver enters the battlefield, proliferate. (Choose any number of permanents and/or players with counters on them, then give each another counter of each kind already there.)

{1}, Sacrifice a creature or enchantment: Exile the top card of your library. You may play that card this turn.

This spell can't be countered.
Flying
When Aunor, Dragonsire or another Dragon enters the battlefield under your control, untap target land. That land becomes a 5/5 Dragon creature with flying and haste in addition to its other types.

This spell can't be countered.
Hexproof

Reach
When Automated Overwatch enters the battlefield, create a Function token with “If this spell would create one or more tokens, it creates twice that many of those tokens instead.” (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)

Whenever you gain life, amass Zombies 1. (Put a +1/+1 counter on an Army you control. It's also a Zombie. If you don't control one, create a 0/0 black Zombie Army creature token first.)
If you would gain life except for the first time each turn, instead each opponent loses 1 life. (If multiple sources would cause you to gain life at the same time, choose one to be first.)

Haste
When Backdrop Artisan dies, audition for red. (Create a 1/1 Construct Actor creature token, a Warrior Role giving 3/2 and trample, or a Wizard Role giving 2/2 and prowess. Roles replace older ones.)

When Backstage Broken enters the battlefield, create a 1/1 colorless Construct Actor creature token.
Whenever a token you control leaves the battlefield, you gain 1 life.

Deathtouch
When Backstage Comic enters the battlefield, target player discards a card.

Lifelink
Whenever Backstage Prompter deals combat damage to a player, put a +1/+1 counter on it.

When Banished Prophet enters the battlefield, you may remove a counter from a permanent you control. If you do, put a +1/+1 counter on another target creature you control.

{T}: Add one mana of any color.
{2}, {T}: Put a lore counter on a Saga you control.

Lifelink
When Black Curtain Enforcer enters the battlefield, you may return target creature card with mana value 3 or less from your graveyard to your hand.