msem-instigator

When Terror of the Ontarachie enters, choose one —
• Each player sacrifices a creature.
• Each player loses 5 life.

Kicker {4}{U}{U} (You may pay an additional {4}{U}{U} as you cast this spell.)
Return target nonland permanent to its owner's hand. If this spell was kicked, create an 8/8 blue Kraken creature token with trample.

Return target creature you control and target creature you don't control to their owners' hands. Target player discards a card.
Coalesce {4}{U}{B} (You may cast this from your graveyard for {4}{U}{B}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)
Terrors of Cuxuri Trench can't block.

First strike
Tesqua Cohort enters with a +1/+1 counter on it if you control another creature with a +1/+1 counter on it.

When Tessellated Orb enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.
When Tessellated Orb dies, draw a card.

Create an X/X green Mutant creature token.
Draw a card.

Trial 3 (As you cast this spell, an opponent of your choice may pay 3 life. If they don't, they fail the trial.)
Target creature gets +1/+0 and gains menace until end of turn. If the trial was failed, other creatures you control gain menace until end of turn.

Trial 3 (As you cast this spell, an opponent of your choice may pay 3 life. If they don't, they fail the trial.)
Discard a card, then draw a card. If the trial was failed, you may instead discard two cards. If you do, draw two cards.

This spell costs {1} less to cast for each artifact you control.
Gain control of target creature until end of turn. Untap that creature. It gains menace and haste until end of turn.

Target creature you control explores. When it does, it deals damage equal to its power to target creature or planeswalker. (Reveal the top card of your library. Put it into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then you may put that card in your graveyard.)

Target creature you control gets +1/+1 until end of turn. It fights target creature you don't control.

Create a 1/1 white Bird creature token with flying, then invigorate 1. (Choose a creature with the least power among creatures you control and put a +1/+1 counter on it.)

Enchant nonland permanent
Enchanted permanent's activated abilities can't be activated and triggered abilities of enchanted permanent don't trigger.

When Thailen's Guard dies, you gain 2 life and scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

Enchant opponent
Whenever enchanted player draws a card or casts a spell, put a foreshadow counter on Thalassophobia.
Remove eight foreshadow counters from Thalassophobia and sacrifice it: Create an 8/8 blue Kraken creature token.

When Thallid Cultivator dies, mill four cards. Return a creature card milled this way to your hand.

First strike
Each other nontoken creature you control enters with an additional +1/+1 counter on it.

Lifelink
Bulwark — Whenever Tharanos' Sentinel attacks, if you control a creature with toughness 4 or greater, untap it.

Bulwark — If you control a creature with toughness 4 or greater, each creature you control assigns combat damage equal to its toughness rather than its power this turn.
Creatures you control get +0/+2 until end of turn.

Flying
Other Vampire creatures you control get +1/+0 and have menace.

Enchant creature you control
When Thassa's Benefaction enters, scry 2.
Enchanted creature gets +1/+0 and has flying.

Heroic — Whenever you cast a spell that targets Thassa's Shoreguards, tap target creature an opponent controls. It doesn't untap during its controller's next untap step.
Whenever Thassa's Shoreguards deals combat damage to a player, draw a card.

{5}{U}{U}: Thassa's Tidebringer can't be blocked this turn. This ability costs {1} less to activate for each creature you control with a counter on it.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
Audition for black. (Create a 1/1 Construct Actor creature token, a Cleric Role giving 2/2 and lifelink, or a Warlock Role giving 2/1 and flying. Roles replace older ones.)
Until end of turn, if a creature you don't control would die, instead exile it and that creature's controller loses 2 life.
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Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)