msem-instigator

Tap up to two target creatures.
Flashback {3}{W/U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

When Featherfall Ascetic enters, create a 1/1 white and blue Bird creature token with flying.
Whenever a nontoken Aura enters enchanting Featherfall Ascetic, for each other creature you control, you may create a token that's a copy of that Aura enchanting that creature.

Creatures can't attack you unless their controller pays {2} for each of those creatures.
Whenever a permanent is returned to a player's hand, create a 1/1 white and blue Bird creature token with flying.

Target player mills X cards, where X is the number of cards in your graveyard.
Flashback {3}{U/B}{U/B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Each opponent plays with the top card of their library revealed.
During each of your turns, you may play one card from the top of an opponents' library, and you may spend mana as though it were mana of any color to cast that spell.

Each player mills three cards.
Draw a card.

Trample
Chained Ravager can't attack or block unless a player has lost life this turn.

Menace
Creatures you control with mana value 1 get +2/+0 and have menace.

As an additional cost to cast this spell, sacrifice a creature.
Kindle the Cursed deals 3 damage to target creature and 3 damage to that creature's controller.

Whenever another creature enters, Brutish Champion fights that creature.

Until end of turn, creatures you control get +1/+1 and gain “{T}: This creature fights target creature.”

Target creature gets +3/+1 and gains trample until end of turn.

Vigilance
If another creature would die, exile it instead.
At the beginning of your upkeep, return each creature card exiled with Arbiter of Endless Summer to the battlefield under its owner's control.

When Chroma's Guidance enters, create a 2/2 green Wolf creature token.
Whenever you create a creature token, put a +1/+1 counter on it.

Tap another untapped creature you control: Knight of the Orchards gets +1/+1 until end of turn.

As an additional cost to cast this spell, discard a card.
Create three 1/1 black Spirit creature tokens with flying.

Enchant player
When Kazimir's Inquisition enters, enchanted player chooses four card names.
Whenever enchanted player casts a spell, if it doesn't have one of the chosen names, enchanted player loses 4 life.

Flying
Whenever another creature you control dies, creatures you control get +1/+1 until end of turn.

Target creature gets +2/+0 until end of turn and can't be blocked except by three or more creatures this turn.
Flashback {U/R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Choose a card name, then look at the top card of your library. If it has the chosen name, you may exile it and you may play it from exile until end of turn.
Whenever a creature you control becomes tapped, you may return Enigma of Seventy Scrolls from your graveyard to your hand.

Whenever you cast a noncreature spell, creatures you control get +1/+1 until end of turn.

Sacrifice a creature: Put a +1/+1 counter on Blightroot.
Sacrifice a land: Blightroot gains indestructible until end of turn.

When Blossom-Sower Witch enters, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)
Whenever you sacrifice a permanent, you gain 1 life.

You may cast Hunter of the Moon-Serpent from your graveyard as long as you gained life this turn.

Creatures you control get +2/+0 until end of turn.