msem-instigator

Whenever you cast a spell that's red, green, white, or blue, each opponent loses 1 life and you gain 1 life.

Trample
Whenever Saghira, Divinity's Usurper attacks, you may pay {1}{G}. If you do, destroy target artifact, enchantment, or creature with flying.

Whenever you cast your second spell during each of your turns, you may activate one of Salome's loyalty abilities.
[+1]: Draw a card. Untap up to two lands.
[–4]: Destroy all creatures.
[–8]: You get an emblem with “You may pay {0} rather than pay the mana cost for the second spell you cast each turn.”

When Salome Breaks the Lies enters, search your library for a legendary black card, reveal it, put it into your hand, then shuffle.
Whenever you cast your second spell each turn, target opponent discards a card if it's your turn. If they didn't discard a card this way, instead they lose 2 life and you draw a card.

Each opponent loses 3 life and you gain 3 life.
Whenever you cast your second spell each turn, if Salome's Intervention wasn't put into your graveyard this turn, return it from your graveyard to your hand.

Salome's Messenger enters tapped.
Whenever you cast your second spell each turn, you may return Salome's Messenger from your graveyard to your hand.

You draw two cards and you lose 2 life. Create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

Put a +1/+1 counter on target creature. That creature gains first strike until end of turn.
Compose (Then if you cast this from your hand, exile it and create a Saga token with “r3—You may cast a copy of this card from exile without paying its mana cost.”)

Whenever Scathing Critics deals combat damage to a player or planeswalker, put a +1/+1 counter on it.

Choose one or both —
• Scene to Cinders deals 2 damage to each token creature.
• Scene to Cinders deals 2 damage to each nontoken creature.

At the beginning of your upkeep, you lose 1 life, then 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.)

{U}, Sacrifice Seal of Insights: Look at the top four cards of your library. Put one into your hand and the rest on the bottom of your library in any order.

When Sealed Evil in a Cage enters, exile target creature an opponent controls with mana value 3 or greater until Sealed Evil in a Cage leaves the battlefield.

Whenever a permanent you control leaves the battlefield, Second-Day Slayings deals 1 damage to each opponent.

When Second-Stage Actress enters, audition for white. (Create a 1/1 Construct Actor creature token, a Scout Role giving 2/3 and vigilance, or a Cleric Role giving 2/2 and lifelink. Roles replace older ones.)
As long as it's your turn, Second-Stage Actress has first strike.

Whenever you cast your second spell each turn, each opponent loses 1 life and you gain 1 life.

Flying
Whenever you cycle Seraph of the Stage or it attacks, audition for white. (Create a 1/1 Construct Actor creature token, a Scout Role giving 2/3 and vigilance, or a Cleric Role giving 2/2 and lifelink. Roles replace older ones.)
Basic landcycling {1}{W} ({1}{W}, Discard this card: Search your library for a basic land card, reveal it, and put it into your hand, then shuffle.)

You may have Shaper of the Formless enter as a copy of any creature on the battlefield, except it has “{2}{U}: Target face-down creature becomes a copy of this creature until end of turn. Turn that creature face up. At the beginning of the next cleanup step, turn it face down.”

Discard a card, then draw a card.
Compose (Then if you cast this from your hand, exile it and create a Saga token with “r3—You may cast a copy of this card from exile without paying its mana cost.”)

When Shifty Squirrel enters, you gain 3 life.
Sacrifice a creature: Transform Shifty Squirrel.

Shining Showstopper deals 5 damage to any target. 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.)

Mark (Whenever this creature attacks, mark target creature until end of turn.)
Marked creatures your opponents control lose all abilities.

This spell costs {2} less to cast for each face-down creature you control.
Flying

Counter target spell unless its controller pays {1} and 3 life.

You gain hexproof until end of turn.
Prevent all damage that would be dealt to you this turn.