msem-instigator

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When Northwind Master enters, you may have another target creature you control gain prowess until end of turn.

Fahrib Informant can't be blocked by creatures with greater power.
Whenever one or more creatures you control deal damage to an opponent, put a +1/+1 counter on Fahrib Informant.

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever a creature you control attacks alone, add a quest counter.
1, 2 — Target creature can't block this turn.
3 — Gain control of target creature until end of turn. Tap it. It becomes attacking.
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When Colony Queen enters, create three 1/1 green Insect creature tokens.
Insect tokens you control have flying and deathtouch.

Menace
Whenever Tamaak's Mouth attacks, defending player sacrifices a nonland permanent.

Reverberate {2}{U} (When you cast this spell, copy it if you paid its reverberate cost. You may choose new targets for the copy.)
Target creature gets +0/+3 and gains hexproof until end of turn.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Target opponent mills three cards.
III — You may cast target nonland card from a graveyard this turn and you may spend blue mana as though it were mana of any color to cast it.

At the beginning of each upkeep, if an opponent controls more creatures than you, create a 1/1 colorless Thopter artifact creature token with flying.

({T}: Add {R} or {W}.)
Gnarled Henge enters tapped unless you control two or more basic lands.

Exile X target creature cards from graveyards. You gain life equal to the total mana value of those cards.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Reveal the top two cards of your library. Put up to one land card from among them onto the battlefield and the rest into your graveyard.
III — Until end of turn, target creature gets +X/+0 and gains indestructible, where X is the number of lands you control.

Return any number of lands you control to their owner's hands. For each land returned this way, search your library for a land card, reveal it, then put it into your hand. Then shuffle.

Destroy target artifact.
Reprise {R} (As you cast an instant or sorcery spell, you may exile one card with reprise from your graveyard and pay its reprise cost. If you do, add its effects to that spell.)

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you cast your first spell outside your main phase each turn, add a quest counter.
1, 2 — Draw cards equal to the number of quest counters on Siltbottom Expedition, then discard that many cards.
3 — Put up to two target instant or sorcery cards from your graveyard on top of your library in any order, then draw a card.

When Fleshcage Shambler dies, create a 2/2 colorless Spirit creature token.

Whenever Dusk Insurgent perseveres, create a 1/1 white Warrior creature token. (A creature perseveres when it survives damage.)

Gestalt (When this or another creature enters under your control, you may merge it with the one in play, keeping counters and attachments. They become the permanent on top plus all abilities from under it.)
If you would gain life, you may put a +1/+1 counter on this creature instead.
When this creature has toughness 20 or greater, you win the game.

Barren Boneyard enters tapped.
{T}: Add {B}.
{2/B}{2/B}: Barren Boneyard becomes a 2/3 black Elemental creature with deathtouch until end of turn. It's still a land.

Flying
{T}: Target land you control becomes the basic land type of your choice until end of turn.

Target creature gets +1/+0 and gains first strike until end of turn.
Target creature blocks this turn if able.

Double strike

Flying, lifelink
When Timestream Sentinel enters, put two +1/+1 counters on each other creature named Timestream Sentinel you control.

Menace
Whenever an opponent casts a spell, Skhorvall Behemoth gets -2/-2 until end of turn.

Choose one. If an opponent lost 3 or more life this turn, choose any number instead.
• Target player sacrifices a legendary creature.
• Target player reveals their hand. You choose a nonland card from it. That player discards that card.
• Exile target player's graveyard.

When Adept Electromancer enters, scry 2, then reveal the top card of your library. If it's an instant or sorcery card, put it into your hand.