msem-instigator

Whenever Toxic Miscreant deals combat damage to a player, that player discards a card.

Shimmer (Whenever this creature attacks, create a tapped and attacking token that's a copy of it. Exile the token at the beginning of the end step.)
When Sandstrider enters, put a +1/+1 counter on target creature.

If a spell or ability would cause its controller to draw a card this turn, that player discards a card instead.
If a player would gain life this turn, that player loses that much life instead.

Enchant creature
When Queenscoming Feast enters, draw a card.
Whenever enchanted creature attacks, create a 1/1 white Peasant creature token.

Flying, haste
Whenever Cheng attacks, look at the top six cards of your library. You may reveal a creature card from among them and put it into your hand. If it's a Dragon, put it onto the battlefield tapped and attacking instead. Put the rest on the bottom of your library in a random order.

Until end of turn, if a source you don't control would deal damage to you or cause you to lose life, mill that many cards instead.

When Serum Peddler enters, you draw a card and you lose 1 life.

Whenever you cast a spell during an opponent's turn, put a +1/+1 counter on Champion of the Fae.

When Second-Stage Actress enters, audition for white. (Create a 1/1 Construct Actor creature token, a Scout Role giving 2/3 and vigilance, or a Cleric Role giving 2/2 and lifelink. Roles replace older ones.)
As long as it's your turn, Second-Stage Actress has first strike.

Motivate 3 (When this creature enters, you may motivate target creature with lesser power than this by putting three +1/+1 counters on it.)
At the beginning of combat on your turn, you may have target creature you control gain vigilance until end of turn.

Target creature you control gains indestructible until end of turn. Whenever that creature perseveres this turn, create a 2/2 black Zombie creature token. (A creature perseveres when it survives damage.)

Improve {1} ({1}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
At the beginning of your upkeep, exile up to one target nonland permanent you own. Return that card to your hand. If Soul Reader has two or more counters on it, you may instead return that card to the battlefield under your control.

At the beginning of your upkeep, you may pay 2 life. If you do, exile the top card of target opponent's library. If a nonland card is exiled this way, copy it. You may cast the copy. (You still pay its costs, including color. Copies of permanents enter as tokens.)

When Keeper of Pearls enters or a creature you control scavenges it, you gain 2 life.
Scavenge {G} ({G}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

Spirited (When this creature enters, you may activate one of its activated abilities without paying its cost.)
{1}, {T}: Look at the top card of your library. You may put the card back or into your graveyard.

Wither (This deals damage to creatures in the form of -1/-1 counters.)
Instant and sorcery spells you control have wither. (They deal damage to creatures in the form of -1/-1 counters.)

Counter target spell if it has mana value 2 or less or if this spell was foretold.
Foretell {1}{U} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

{T}, Tap two other untapped creatures you control: Add two mana of any one color.

Storied spells you cast cost {1} less to cast. (Enchantments and legendary cards are storied.)

Attacking creatures get +2/+0 and gain trample until end of turn.

Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle.
Reconstruct {X}{G}{G}{G} (You may cast this from your graveyard for its reconstruct cost reduced by the mana value of a permanent you sacrifice as you cast it this way. Then exile this.)
You can't sacrifice creatures or lands to pay Never Enough's reconstruct cost.

Creatures with power less than Seer of the Hunt's power can't block it.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
Whenever a +1/+1 counter is put on Treecrawler Elemental, you may have it fight target creature. (Each deals damage equal to its power to the other.)

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.

This spell costs {2} less to cast if your life total is less than or equal to half your starting life total.
Destroy all creatures.