msem-instigator

Choose one —
• Target opponent reveals their hand. You may choose a creature, enchantment, or planeswalker card from it. That player discards that card.
• Target opponent sacrifices an enchantment.

When Extracurricular Studies enters, search target opponent's library for a card and exile it. Then that player shuffles.
You may play cards exiled by Extracurricular Studies and you may spend mana as though it was mana of any type to cast them. When you do, return Extracurricular Studies to its owner's hand.

At the beginning of your upkeep, each player loses 3 life unless they sacrifice a creature.
Sacrifice a creature: Fateseal 1. (Look at the top one cards of an opponent's library, then put any number on the bottom and the rest on top in any order.)

When Eyes of the Maghbri enters, if you control a creature token, create a 2/2 black Hound creature token.

Look at target player's hand. You choose a nonland card from it. That player discards that card.
Create a 1/1 blue Jellyfish enchantment creature token with slipstream. (It can't be blocked as long as only creatures with slipstream are attacking.)

Other creatures get -1/-1.
Recite {1}{B} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters or if it would leave the battlefield.)

Exile target creature or planeswalker with mana value 4 or less.

When Faithless Deserter enters, you may sacrifice a creature. If you do, each opponent sacrifices a creature.

All creatures get -2/-2 until end of turn.
Metamorph {1}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up and cast it at any time for its metamorph cost.)

Whenever you draw a card, put a quest counter on Fallback Plan.
Remove four quest counters from Fallback Plan and sacrifice it: Search your library for a card, put that card into your hand, then shuffle.

Flying, lifelink
Fallen Celestial can't block or be blocked by Angels, Demons, or Faeries.
At the beginning of each opponent's upkeep, that player loses 1 life and creates a 1/1 black Faerie creature token with flying.

As an additional cost to cast this spell, sacrifice a creature.
Create three 1/1 black Worm creature tokens.

Enchant creature
Enchanted creature has flying and “Sacrifice a creature: This creature gets +2/+1 until end of turn.”
When Fallen Ideal is put into a graveyard from the battlefield, return Fallen Ideal to its owner's hand.

Exile target creature or planeswalker, then for each counter on that permanent, you may put a counter of that kind on a permanent you control.

Whenever you gain life, target opponent loses that much life.
{T}, Pay 3 life: Flip a coin. If you win the flip, you gain 6 life.

Each player returns up to one creature card from their graveyard to their hand. Each opponent sacrifices a creature.

This spell costs {3} less to cast if it targets a creature with mana value 2 or less.
Destroy target creature.

Exile target creature. Its controller loses 3 life.

Choose one —
• Exile all creature tokens.
• Exile target creature or planeswalker.
• Each opponent exiles a card from their hand and loses 2 life.

Each player sacrifices a creature. Purge. (Exile two cards that share a type from graveyards. If you do, draw a card.)

Destroy target creature or planeswalker with mana value 2 or less. Create a tapped Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

Enchant creature
Embody (Enchanted creature is a copy of this card except for its types.)
Whenever Fate of the Weary becomes tapped, create a 0/1 black Spirit creature token with flying.

Search your library for a card, reveal it, then shuffle and put that card on top. You lose life equal to its mana value.

When Fatethief dies, put the bottom card of your library into your hand.
Revive {2}{B}{B} ({2}{B}{B}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Faux, Who Lives for the Hunt enters as a copy of a creature card in your graveyard except it's legendary and has changeling and “When this creature dies, if it didn't have a bounty counter on it, return it to the battlefield with a bounty counter.” (It has “When this creature dies, each opponent draws a card” as long as it has a bounty counter on it.)