msem-instigator

Choose up to one creature. Return the rest to their owners' hands.

Menace
At the beginning of your end step, if you lost 4 or more life this turn, you may create Irgh'vall, a legendary 4/4 black Demon creature token with flying.

Vanguard — Whenever a creature you control attacks alone, you may cast a spell with mana value 3 or less from your hand without paying its mana cost.

Deception {U}{B} ({U}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Pay 1 life, Choose a creature card name you haven't chosen for Suzume Oshiruko this turn: Return another creature you control with the chosen name to its owner's hand.

You may tap two untapped red creatures and/or planeswalkers you control with different names rather than pay this spell's mana cost.
Exile the top two cards of your library. Until the end of your next turn, you may play those cards.

Target player reveals their hand. Exile a nonland card from it and put a secret counter on it. As long as that card remains exiled, that player may pay {2} any time they could cast a sorcery to put it into their hand.
{X}{B}{B}, Exile Swipe Secrets from your graveyard: Until end of turn, you may cast target card you exiled with a secret counter on it and mana value X without paying its mana cost.

Enchant creature
When Sylvan Majesty enters, search your library for a Forest card, put it onto the battlefield tapped, then shuffle.
Enchanted creature gets +3/+3.

Destroy target nonland permanent. If it had flying, put a flying counter on a creature you control. Do the same for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.

Draw three cards, then discard a card unless you exile two cards from your graveyard.

Flying
When Tattered Wisp enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

Exile target permanent, then return that card to the battlefield under its owner's control.
Draw a card.

Trample
Death knell — Put a +1/+1 counter on Tempest Dodger. (As a creature you control dies, trigger one death knell of that creature or another permanent you control.)

When you unveil Tempest Termagant, you may put target land on top of its owner's library.

Take an extra turn after this one. During that turn, you may look at and play the top card of your library.
Exile Temporotomy.

Target creature you control explores. When it does, it deals damage equal to its power to target creature or planeswalker. (Reveal the top card of your library. Put it into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then you may put that card in your graveyard.)

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Death knell — All creatures get -1/-1 until end of turn. (As a creature you control dies, trigger one death knell of that creature or another permanent you control.)
{B}, Sacrifice a creature: Choose a card in your graveyard with mana value less than the sacrificed creature's mana value. You may cast it without paying its mana cost.

The Flames Approach deals 3 damage to any target.
Memento {3}{R}{R} (You may cast this from your graveyard for {3}{R}{R}. If you do, put it onto the battlefield transformed after it resolves. Exile it if it would leave the battlefield or not resolve.)

First strike, trample
Death knell — Return a permanent card with mana value less than X from your graveyard to the battlefield, where X is the mana value of the last creature that died this turn. (As a creature you control dies, trigger one death knell of that creature or another permanent you control.)

Deathtouch, hexproof from non-Adventure
Whenever a creature dealt combat damage by a creature you controlled this turn dies, draw a card.

As The Mistake enters, choose a card name.
Activated abilities of sources with the chosen name can't be activated unless they're mana abilities.
Unveil {5} ({5}: Transform this. Unveil only as a sorcery.)

Codex — Out-of-Body Experience; Event Horizon; Strike from the Shadows; Second Death; Anguished Unmaking. (As this enters, conjure its contents into a shuffled face-up additional library.)
You can't draw from this codex's library.
Whenever a creature you control dies, put a card from this codex's library into your hand.

Draw three cards. Then discard two cards unless you discard a card that has the same name as a permanent you control or a card in your graveyard.

Thriving Bluff enters tapped.
As Thriving Bluff enters, choose a color other than red.
{T}: Add {R} or one mana of the chosen color.

Thriving Grove enters tapped.
As Thriving Grove enters, choose a color other than green.
{T}: Add {G} or one mana of the chosen color.