msem-instigator

When Backstage Broken enters the battlefield, create a 1/1 colorless Construct Actor creature token.
Whenever a token you control leaves the battlefield, you gain 1 life.

Flying
{B/G}, Discard a creature card: Badru, the Skyshadow becomes a copy of the discarded card until end of turn, except he has flying and is 5/5.

Whenever Baljurn, the Runelord or another nontoken artifact or enchantment enters the battlefield under your control, create a 0/0 blue Construct artifact creature token. Put a +1/+1 counter on each artifact and/or enchantment creature you control other than Baljurn.

Whenever Barker Duelist becomes blocked, defending player loses 1 life.
Unveil {3}{B}{R} ({3}{B}{R}: Transform this. Unveil only as a sorcery.)

Whenever Beatrice's Dodger attacks, create a 1/1 black and red Human Rogue creature token that's tapped and attacking.
{3}{B}{R}: Return Beatrice's Dodger from your graveyard to the battlefield
tapped and transformed.

Choose target creature with the greatest power or tied for the greatest power, then destroy all other creatures.

Prevent all combat damage that would be dealt to and dealt by Bereaved Aristocrat.
Unveil {2}{W}{U} ({2}{W}{U}: Transform this. Unveil only as a sorcery.)

At the beginning of your upkeep, mill a card.
Whenever a creature card is put into your graveyard from anywhere, if that card has flying, you may put a flying counter on Berylscale Alaj. Repeat this process for first strike, double strike, deathtouch, hexproof, lifelink, menace, reach, trample, and vigilance.

Return to your hand all permanent cards in your graveyard that were put there from the battlefield this turn.

Sacrifice a creature: Put a +1/+1 counter on Blightroot.
Sacrifice a land: Blightroot gains indestructible until end of turn.

Flash
Blind Blackguard can't block.
When Blind Blackguard enters the battlefield, target player draws a card, then reveals their hand. You choose a nonland card from that player's hand, then that player puts the chosen card on the bottom of their library.

When Blinding Fiddler enters the battlefield, until your next turn, creatures can't attack you or a planeswalker you control unless their controller pays {2} for each of those creatures.
Unveil {3}{W}{U} ({3}{W}{U}: Transform this. Unveil only as a sorcery.)

When Blossom-Sower Witch enters the battlefield, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)
Whenever you sacrifice a permanent, you gain 1 life.

If you would draw a card, you may instead choose creature or land and exile cards from the top of your library until you exile a card of the chosen type. Put that card into your hand and put all other cards exiled this way on the bottom of your library in a random order.

Prowess
Unveil {2}{U}{R} ({2}{U}{R}: Transform this. Unveil only as a sorcery.)

Flash
Whenever you cast your second spell each turn, put a +1/+1 counter on Brooding Replacement.

Double strike
Whenever you cast a noncreature spell, you may choose one that hasn't been chosen —
• Tap or untap target permanent.
• Draw two cards, then discard a card.
• Creatures you control get +1/+1 until end of turn.

Whenever another creature enters the battlefield, Brutish Champion fights that creature.

Bwema, the Ruthless enters the battlefield with your choice of two different counters on it from among menace, first strike, vigilance, and lifelink.

Deathtouch
Once each turn, when another nontoken creature enters the battlefield under your control, you may sacrifice it. If you do, create a token that's a copy of it except it's a green Dryad in addition to its other types.

When Callow Survivors enters the battlefield, you may return target artifact or enchantment card with mana value 3 or less from your graveyard to the battlefield.

Vigilance
Unveil {2}{G}{W} ({2}{G}{W}: Transform this. Unveil only as a sorcery.)

If a source would deal damage to a creature in Cascading Zhenzu's pack, prevent 1 of that damage. (Two or more creatures you control with equal power are in a pack.)
{U}: You may switch Cascading Zhenzu's power and toughness until end of turn.

First strike (This creature deals combat damage before creatures without first strike.)
Whenever Cauldish Warmonger attacks, create a 1/1 white Soldier creature token that's tapped and attacking.

Counter target activated or triggered ability of a nonland source. If an ability of a creature, enchantment, or planeswalker is countered this way, exile it.