msem-instigator

Whenever you draw a card, Silverblood Aspirant gets +1/+1 until end of turn.
{1}{R}, Discard a card: Draw a card.

Vanishing 3 (This permanent enters the battlefield with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
Whenever a time counter is removed from Thespian's Finale, create a token that's a copy of target creature. Sacrifice that token at the beginning of your next upkeep.

Unassuming Waif can't be blocked.
Unassuming Waif gets +1/+0 for each other Warrior you control.

Enchant creature
Enchanted creature can't be blocked.
{1}{G}: Enchanted creature gets +1/+1 and gains hexproof until end of turn.

Hexproof
When Wary Watchkeeper enters the battlefield, target player mills three cards.

When Whisper Collector dies, draw a card.

When Baneblade Stalker enters the battlefield, proliferate. (Choose any number of permanents and/or players with counters on them, then give each another counter of each kind already there.)

Vanishing 1 (This permanent enters the battlefield with a time counter on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
When the last time counter is removed from Conspiracy of Ravens, target player reveals their hand. You choose a nonland card from it. That player discards that card.

Target player sacrifices a creature.
{2}{G}, Exile Crystal Puncture from your graveyard: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Distribute two -1/-1 counters among one or two target creatures.

{B}, Remove a time counter from a permanent you control: Target player loses 1 life.

Target player reveals their hand. You choose a nonland card from it. That player discards that card, then mills four cards.

When False-Cure Smuggler enters the battlefield, put a -1/-1 counter on another target creature.
{1}{U}, Sacrifice a creature: Proliferate. (Choose any number of permanents and/or players with counters on them, then give each another counter of each kind already there.)

When Festering Waif enters the battlefield, each opponent mills two cards.
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.)

When Feverish Noble dies, you draw two cards and you lose 2 life.

Vanishing 1 (This permanent enters the battlefield with a time counter on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
When Flesh to Rot enters the battlefield or the last time counter is removed from it, all creatures get -3/-3 until end of turn.

Return target creature card from your graveyard to your hand.

Lifelink
Frenzied Watchkeeper enters the battlefield with six -1/-1 counters on it.
At the beginning of each end step, if an opponent lost life this turn, remove a -1/-1 counter from Frenzied Watchkeeper.

As an additional cost to cast this spell, sacrifice a permanent.
When Harriet, Liberated Wildborn enters the battlefield, you may remove all counters from target permanent.

Target player discards two cards and loses 2 life. Scry 2. (To scry 2, look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Whenever a player casts a spell, that player reveals cards from the top of their library until they reveal two land cards, then puts all cards revealed this way into their graveyard.

Iron Warden enters the battlefield with three -1/-1 counters on it.
When Iron Warden dies, you may distribute X -1/-1 counters among any number of target creatures, where X is the number of -1/-1 counters on Iron Warden.
{2}{R}: Put a -1/-1 counter on target creature.

[+1]: Discard a card. If you do, each opponent discards a card and loses 1 life.
[–3]: Destroy target creature or planeswalker.
[–7]: Draw a card for each creature card and planeswalker card in all graveyards. Target opponent loses that much life.

Each player chooses a nonland permanent they control, then sacrifices the rest.

Destroy target creature that was dealt damage this turn, then create a 3/2 black Mutant Horror creature token.