msem-instigator

When Moth-Heart Husk dies, create a 1/1 black Spirit creature token with flying.
Revive {3}{B} ({3}{B}, Exile this card from your graveyard: Create a token that's a copy of this card, except it has no mana cost. Activate this ability only any time you could cast a sorcery.)

({T}: Add {R}.)
As Cloudpeak Spires enters, you may pay 1 life. If you don't, Cloudpeak Spires enters tapped.
Basic lands you control have “{T}: Add {R}.”

Smiting Helix deals 3 damage to any target and you gain 3 life.
Flashback {R}{W} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Choose one —
• Target creature gets +1/+0 and gains indestructible until end of turn.
• Tap target creature. Put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)
• Scry 1, then draw a card.

Flying
Whenever you cast a spell, exile the top card of your library.
At the beginning of your end step, put a card exiled with Korephyr, Riddle Sage into its owner's hand. Put each other card exiled with Korephyr on the bottom of its owner's library in a random order.
{3}{U/B}: Scry 2.

Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Forgotten Experiment can't be blocked.

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Enchanted creature gets +2/+3 and has lifelink.

When Goblin Rocktosser enters, you may sacrifice a land. If you do, put a +1/+1 counter on Goblin Rocktosser.

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 Condemned Cavalier enters, create a white and black Aura Curse enchantment token named Profane March attached to target player. The token has enchant player and “Whenever a creature enchanted player controls attacks, that player loses 1 life and defending player gains 1 life.”

Enchant creature
As long as it's your turn, enchanted creature has indestructible.
Whenever enchanted creature attacks, it deals damage equal to its toughness to any target.

Whenever a land creature you control deals combat damage to a player, put a +1/+1 counter on it.
{1}{G}: Put a +1/+1 counter on target land you control. It becomes a 0/0 Elemental creature that's still a land.

{1}, {T}: Draw a card, then exile a card from your hand face down until Cluttered Study leaves the battlefield. (It returns to your hand.)
{3}, {T}: Shuffle Cluttered Study into its owner's library.

{4}, {T}, Exile Deathwind Detonator: Destroy all nonland permanents. Each player gets an emblem with “At the beginning of your upkeep, you lose 1 life.”

Flying
At the beginning of your upkeep, if it isn't an extra turn, put a sage counter on Magistrate of Eras.
Remove five sage counters from Magistrate of Eras: Take an extra turn after this one.

When Aerie Bell-Warden enters, if it's in a pack, you gain 5 life. (Two or more creatures you control with equal power are in a pack.)

{3}: Wildwood Keeper gets +3/+2 until end of turn. Activate only once each turn.

Lifelink
When Sunlight Dancer enters, target opponent gains 4 life.

Draw three cards.
Skip your next turn. If it's your turn, end the turn.

{T}, Sacrifice another creature: Return target creature card with mana value equal to 1 plus the sacrificed creature's mana value from your graveyard to the battlefield. Activate only as a sorcery.

Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Exile target creature, then exile target creature card from a graveyard. An opponent chooses one of them. Put the chosen card onto the battlefield under your control.

Spirited (When this creature enters, you may activate one of its activated abilities without paying its cost.)
{1}, {T}: Choose a nonland card name. Reveal the top three cards of your library and put each revealed card with that name into your hand. Put the rest into your graveyard.

Prowess
Whenever you cast a noncreature spell, audition for blue or for red. (Create a 1/1 Construct Actor creature token, a Wizard Role giving 2/2 and prowess, a Warlock Role giving 2/1 and flying, or a Warrior Role giving 3/2 and trample. Roles replace older ones.)