msem-instigator

Target creature gets -3/-0 until end of turn. That creature's controller mills six cards.

Reach
When Falkenrath Fletcher enters, if an opponent lost life this turn, create a 1/1 black and red Vampire creature token with menace.

Spirited (When this enters, you may activate one of its activated abilities without paying its cost.)
{1}, {T}: Add one mana of any color. When you do, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Draw cards equal to the number of cards in your hand, then discard three cards.
Cycling {U} ({U}, Discard this card: Draw a card.)

Archive 3 (As this enters, shuffle the top three cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
Whenever you draw a card from the archived library, you exile up to one target creature. Return that card to the battlefield under its owner's control at the beginning of the next end step.

Crystal Garden enters tapped.
{T}: Add one mana of any color. You can't spend this mana to cast a creature spell.

Sacrifice a creature: Put a +1/+1 counter on Bloodlash Caravan. Then if it's the only creature you control, it gains indestructible until end of turn.

Prismatic — Whenever you cast a multicolored spell, if you cast it from your hand, look at the top four cards of your library. You may cast a multicolored card that's different colors and costs less from among them without paying its mana cost. Put the rest on the bottom of your library in any order.

Reach
When Scavenging Pack enters, you may destroy target artifact with mana value 2 or less.

Menace
Whenever Skhorvall Warleader attacks, it gets +1/+0 until end of turn for each other attacking Warrior you control.

Collapsing Ramparts deals damage to target creature equal to twice the number of Satrapies you control.

Exile up to three target creatures you control, then return those cards to the battlefield under your control tapped.

Mill four cards. You may put up to two cards from among the milled cards into your hand. Each player loses 2 life.

At the beginning of each opponent's upkeep, exile Daril's Timewalker and up to one other target nonland permanent you control, then return those cards to the battlefield under their owner's control.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Put a prowess counter on target creature you control. That creature deals 2 damage to each opponent.
II — Scry 3.
III — Until end of turn, if you casting an instant or sorcery spell causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

Flying, lifelink
Fallen Celestial can't block or be blocked by Angels, Demons, or Faeries.
At the beginning of each opponent's upkeep, that player loses 1 life and creates a 1/1 black Faerie creature token with flying.

Chosen one ({W}{U}{B}{R}{G}: Transform this permanent.)
When Sower of Wishes enters, reveal the top three cards of your library. Put all land cards revealed this way into your hand and the rest back on top in any order.

When Bloodsoaked Blades enters, creatures you control get +2/+0 until end of turn.
Equipped creature gets +1/+1.
Equip {1}

When Leafguard Larva enters or a creature you control scavenges it, return target card from your graveyard to your hand.
Scavenge {3}{G} ({3}{G}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
When Winding Snake has three or more +1/+1 counters on it, remove them all and transform it.

Rehison Soothemage has lifelink as long as you control another Elf.

Trample
Fallen Warden's power and toughness are each equal to the number of creature cards in all graveyards.

Enchant creature
Enchanted creature gets +2/+0 and has haste.

(As an Encounter enters, choose an opponent to protect it. You and others can attack it. When defense counters are removed, create a 0/0 Army token if you don't control one, then put that many +1/+1 counters on a Army you control.)
When Dawn Over Danaj enters or is defeated, draw cards equal to the greatest power among creatures you control.