msem-instigator

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

Whenever a face-down creature you control attacks, defending player loses 1 life.
{2}, Discard a card: Manifest the bottom card of your library. Activate only once each turn. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Manifest a creature card at random from your graveyard. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Skip your draw step.
At the beginning of your end step, discard a card. If you do, create a 4/4 white Angel creature token with flying. If you can't, sacrifice Mark of Hubris.

Whenever one or more cards are put into exile from anywhere, target opponent loses 1 life.
Whenever one or more creatures you control deal combat damage to a player, you may pay 2 life. If you do, purge. (Exile two cards that share a type from graveyards. If you do, draw a card.)

Players can't gain life.
At the beginning of each player's upkeep, if that player has 10 or less life, they lose 1 life.

You draw X cards and you lose X life, where X is the number of cards in your graveyard.

Menace
Ni'Ama's Emissary gets +1/+1 as long as you control a red or white permanent.

Whenever a land enters under an opponent's control, that player loses 2 life and you gain 2 life.

Trial 4 (As you cast this spell, an opponent of your choice may pay 4 life. If they don't, they fail the trial.)
Put target creature card from a graveyard onto the battlefield under your control. That creature gains haste. Sacrifice it at the beginning of the next end step unless the trial was failed.

Manifest all cards from all players' hands. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Trial 3 (As you cast this spell, an opponent of your choice may pay 3 life. If they don't, they fail the trial.)
When Steeple Deadeye enters, if the trial was failed, you gain 3 life and put a +1/+1 counter on Steeple Deadeye.

Trial 3 (As you cast this spell, an opponent of your choice may pay 3 life. If they don't, they fail the trial.)
Target creature gets +1/+0 and gains menace until end of turn. If the trial was failed, other creatures you control gain menace until end of turn.

Purge, then you may pay 2 life. If you do, purge again. (To purge, exile two cards that share a type from graveyards. If you do, draw a card.)

Unwavering Questant can't block.
When an opponent fails a trial, return Unwavering Questant from your graveyard to the battlefield.

Manifest the bottom card of your library. That creature gains lifelink and deathtouch until end of turn. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

When Wilting Waif dies, each opponent discards a card at random and you scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

Adjudicate, then Admonish the Unruly deals damage to target creature equal to the number of Auras you control. (Create a white Aura enchantment token with enchant creature and “Sacrifice this token: Untap enchanted creature” attached to target creature.)

Whenever Angeltouched Komodo attacks, scry 1.
Morph {1}{R} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Whenever Archlegislator attacks, adjudicate. (Create a white Aura enchantment token with enchant creature and “Sacrifice this token: Untap enchanted creature” attached to target creature.)
{3}{R}{R}, {T}, Sacrifice an Aura: Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn.

When Blazeblade Sergeant enters, adjudicate. (Create a white Aura enchantment token with enchant creature and “Sacrifice this token: Untap enchanted creature” attached to target creature.)
Whenever an Aura you control enters, target creature you control gains first strike until end of turn.

Erratic (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order.)
Chaosphere Ravager attacks each combat if able.

Creatures you control get +2/+0 until end of turn.
Whenever an opponent fails a trial, if Combatant Conflagration is in your graveyard, target creature you control gets +2/+0 until end of turn.

As an additional cost to cast this spell, discard a card.
Draw two cards. Add one mana of any color.

Erratic (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order.)
Whenever a creature you control enters, if you didn't cast it from your hand, target land you control becomes a 7/1 red Elemental creature with trample and haste. It's still a land.