msem-instigator

Flying
When Mei's Understudy enters, if you control another Actor, draw a card.

Vigilance, reach
Whenever Cave Spider blocks a creature with flying, Cave Spider gets +2/+0 until end of turn.

Whenever a creature you control enters, if it wasn't cast, you gain life equal to that creature's toughness and may draw a card.
[+2]: Return up to one target creature card from your graveyard to the battlefield.
[–3]: Create an 8/8 blue Kraken creature token.
[–9]: Each player exiles all creature cards from their graveyard, then sacrifices each creature they control. Put each creature card exiled this way onto the battlefield under your control.

When Festival Rioters enters, create a colorless artifact token named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”
{1}{R}: Festival Rioters gets +2/+0 until end of turn.

At the beginning of your upkeep, return a permanent you control to its owner's hand.
You may play an additional land on each of your turns.

When Barbarian Intimidator enters, target creature can't block this turn.
When Barbarian Intimidator enters, prevent all combat damage that would be dealt to target creature this turn.

Trample

Cradle of War enters tapped.
{3}, {T}: You may put an artifact card with mana value 3 or less from your hand onto the battlefield. This ability costs {1} less to activate for each other artifact you control. Activate only as a sorcery.

Thriving Moor enters tapped.
As Thriving Moor enters, choose a color other than black.
{T}: Add {B} or one mana of the chosen color.

Enchant opponent
When Curse of Bleeding enters, enchanted player loses 2 life.
Enchanted player can't gain life.

Improve {1}{B} ({1}{B}: 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.)
Once each turn, when you gain life, you may have each opponent loses 1 life.

Lifelink
Creature tokens you control get +1/+0.
Whenever a token you control enters, each opponent loses 1 life and you gain 1 life. This ability triggers only once each turn.

Enchant creature
When Divine Ascension enters, you gain 2 life.
Enchanted creature gets +2/+1 and has flying.

Another target player reveals their hand. You may choose a nonland card from it. That player discards that card.
Fuse (You may cast one or both halves of this card from your hand.)

Spend only mana produced by Treasures to cast spells.
{2}, Discard a card: Create two Treasure tokens.

Look at the top two cards of your library. You may put both of those cards into your graveyard or back on top of your library in any order.
Draw a card.

Transcend (Activate as a sorcery to gain the next type and a +1/+1 counter.)
You may play cards exiled with Fahrib and you may spend mana as though it were mana of any color to play them.
{U}{B}: Demon — Each player exiles a card from their hand.
{4}{U}{B}: Elder — Exile the top five cards of each player's library. Fahrib gains “Spells you cast from anywhere other than your hand cost {2} less to cast.”

[+1]: Create a white enchantment token named Intangible Virtue. It has “Creature tokens you control get +1/+1 and have vigilance.”
[–3]: Create a 4/4 white Angel creature token with flying. You gain life equal to the number of tokens you control.
[–5]: Exile all other nonland, nontoken permanents.

Whenever an opponent casts a noncreature spell, create a Treasure token. (They're artifacts with “{T}, Sacrifice this artifact: Add one mana of any color.”)

Lifelink
When Anointed Cursebreaker enters, you may exile target artifact or enchantment an opponent controls. When Anointed Cursebreaker is no longer on the battlefield, return the exiled card to its owner's hand.

Enchant land
Enchanted land has “{T}: Exile the top card of your library. If it's a nonland card, you may cast that card this turn.”

When Ragantiar enters, mill five cards.
{3}{B}, Sacrifice a creature: Return target creature card with power X or less from your graveyard to the battlefield, where X is 1 plus the sacrificed creature's power.

Flash
Menagerie — When Tidal Trickster enters, if there are five or more creature types among creatures you control, you may search your library for a card named Tidal Trickster, reveal it, put it into your hand, then shuffle.

Judge each creature you control. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

Noncreature spells you cast cost {1} more to cast.
Noncreature spells your opponents cast cost {1} more to cast unless that player controls more creatures than you.