msem-instigator

[+1]: Create a 1/1 green Merfolk creature token.
[0]: Target artifact or creature loses all abilities and becomes a green Seal creature with base power and toughness 3/3.
[–6]: Up to five target noncreature permanents lose all abilities and become green Merfolk creatures with base power and toughness 1/1.

Return up to two target creature cards with total mana value 3 or less from your graveyard to the battlefield tapped.
Cycling {2} ({2}, Discard this card: Draw a card.)

{4}{W}{W}: Create a 4/4 white Angel creature token with flying.
{2}{W}{W}: Populate. (Create a token that's a copy of a creature token you control.)

When Something in the Woods enters or at the beginning of your upkeep, Something in the Woods explores. If it explores a creature card, you may have it become a copy of that card. (It loses this ability. To explore, reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this, then you may put that card into your graveyard.)

Reach
{1}{B}: Bloomcrawler gains deathtouch until end of turn.

First strike
Noncreature spells cost {1} more to cast as long as their controller is horrific. (A player is horrific as long as they've sacrificed a permanent or discarded a card this turn.)

Creatures you control have “When this creature becomes tapped for the first time during each of your turns, untap it.”
{T}: Add one mana of any color.

At the beginning of your upkeep, create a 1/1 white Soldier creature token.
{1}{G}{W}: Create a 1/1 white Soldier creature token. Activate only during your upkeep and only if Faith is in your graveyard.

Searing Blasphemy deals 2 damage to target creature. If that creature is an Angel, Searing Blasphemy deals 5 damage instead.

{2}{R}{R}, Exile an instant or sorcery card from your graveyard: Fervid Dragonheart gets +1/+2, gains flying, and becomes a Dragon until end of turn.

{X}{W}{W}: Prevent the next X damage that would be dealt to target creature you control this turn. Whenever damage is prevented this way, you gain that much life.

At the beginning of your upkeep, mill a card.
Whenever a creature card is put into your graveyard from your library, you may exile it. If you do, create a 2/2 black Zombie creature token.

Vanishing 3
Whenever a time counter is removed from Prayers of Defiance, return target creature card from your graveyard to your hand.

Exile twice X cards from the top of your library. During your next turn, you may play cards exiled this way.

When Dawn Silhouette enters, you may exile target creature not named Dawn Silhouette you control. Return that card to the battlefield under your control at the beginning of the next end step.
Mirage {1}{W} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

Improve {1} ({1}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
At the beginning of combat on your turn, target creature you control with mana value 3 or less can't be blocked this turn. If Streetwise Investigator has two or more counters on it, that creature gains vigilance until end of turn.

Whenever attackers are declared, defending player may pay 2 life for each creature you control attacking them. Then target creature gets -X/-X until end of turn, where X is the number of times that player didn't pay life this way.

As Sunlit Highland enters, you may pay 2 life. If you don't, Sunlit Highland enters tapped.
{T}, Sacrifice Sunlit Highland: Search your library for a Mountain or Plains card, put it onto the battlefield, then shuffle.

Choose one —
• Destroy target artifact.
• Destroy target enchantment.
• Destroy target creature with flying.
• Target creature you control fights target creature an opponent controls.

Menace
{1}{B}, Exile another three cards from your graveyard: Return Determined Explorer from your graveyard to your hand.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — 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.)
III — 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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Look at the top two cards of your library. Put one of them into your hand and the other on the bottom of your library.

Look at target player's hand. You may choose a nonland card from it. If you do, that player reveals that card, puts it on the bottom of their library, then draws a card.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
Whenever an experience ability puts a +1/+1 counter on a creature you control, put a +1/+1 counter on that creature.

Whenever Scaleblight Cutthroat attacks, each opponent loses life equal to its power.
{4}{B}{B}: Scaleblight Cutthroat gets +3/+3 until end of turn.