msem-instigator

{T}: Add {C}.
{T}, Pay 1 life: Add {R}.
{R}, {T}: Add one mana of any color.

Defender, reach
Aetherlock Effigy can block an additional creature each combat.
When Aetherlock Effigy dies, create two 1/1 black Bird creature tokens with flying.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Create four 1/1 colorless Construct Actor creature tokens.
II — Each player sacrifices a nontoken creature.
III — Each player loses 3 life.

When Bellani Mystic enters, target player mills two cards.

{2}{B}, {T}, Sacrifice another creature: Each opponent loses 2 life and you gain 2 life.

When Swiftwheel Slayers enters, 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.)
Token creatures you control have haste.

This spell costs {X} less to cast, where X is the amount of life you've gained this turn.
Flying
When Angel of Sunrise enters, each opponent exiles a Spirit, Vampire, Werewolf, Zombie, or double-faced permanent they control.

This spell can't be countered.
Trample
Whenever an opponent draws a card except the first one they draw in each of their draw steps, put a +1/+1 counter on Kareki Magehunter.

Exile up to one target activated ability, triggered ability, or nonland permanent.
Coalesce {5}{G}{W}{U} (You may cast this from your graveyard for {5}{G}{W}{U}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)
End of All Things enters tapped.

Lifelink
At the beginning of your end step, you gain 1 life if you gained life this turn, and each opponent that lost life this turn loses 1 life.

Whenever Arisen Helix attacks, scry 2.
If Arisen Helix would die, exile it instead.

Whenever another creature you control enters, target opponent loses 1 life and you gain 1 life.
Sacrifice Somber River Bearer: Creatures you control gain indestructible until end of turn.

When Demonqueller Mage enters, gain control of target creature with power 2 or less until Demonqueller Mage leaves the battlefield.

When this creature enters, if you cast it, reveal the top card of your library. If it's a land card, you may put it onto the battlefield tapped. If it's a nonland card with mana value less than or equal to the number of lands you control, you may cast it without paying its mana cost. If you do neither, put it into your hand.

Exile target card from a graveyard. If this spell was foretold, create a 2/1 white Soldier creature token.
Draw a card.
Foretell {W} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Choose a nonland card name. Search target player's graveyard, hand, and library for any number of cards with that name and exile them. That player shuffles. For each card exiled from their hand this way, you discard a card.

Prowess

Rapport — Whenever Witch's Apprentice and at least one other creature you control become tapped, Witch's Apprentice gets +1/+1 until end of turn, then scry 1.

Each player sacrifices a creature.
Reconstruct {5}{B}{B}{B} (You may cast this from your graveyard for its reconstruct cost reduced by the mana value of a permanent you sacrifice as you cast it this way. Then exile this.)

Glitch {2} (Remove one [restriction] for each time you pay the glitch cost.)
Target creature gets +3/+3 until end of turn [if it has trample]. Then put a trample counter on that creature.

Search your library for two cards and your graveyard for two cards, each with different names, and reveal them. An opponent exiles two of those cards. Put the rest into your hand. Then shuffle.
Exile Words Unspoken.

When Sealed Riftway enters, exile up to one target card from a graveyard.
{2}, {T}, Sacrifice Sealed Riftway: Exile target player's graveyard. Draw a card.

Whenever you activate an ability of a card in your graveyard or cast a spell from your graveyard, create a 1/1 blue and black Bird creature token with flying and ward {1}.
Whenever three or more creatures you control deal combat damage to a player, return target creature card with mana value less than or equal to that number of creatures from your graveyard to the battlefield.

Exile target creature an opponent controls. Each player may search their library for a basic land card and put that card onto the battlefield tapped. Then each player who searched their library this way shuffles.

{T}: Add {C}.
{1}, {T}: Add one mana of any color. When this mana is spent to cast a spell that shares a color with a legendary creature you control, scry 1.