msem-instigator

When Lupine Prowler enters, you may sacrifice another creature. If you do, draw a card and you gain 2 life.
Whenever another creature you control dies, put a +1/+1 counter on Lupine Prowler.

Return target nonland permanent to its owner's hand.

Draw two cards, then discard two cards.
Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Vigilance
When Inquisitive Student enters, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Deathtouch, lifelink
Whenever Batwing Initiate deals combat damage to a player, put a +1/+1 counter on it.
Pay 4 life: Batwing Initiate gains flying until end of turn.

{2}{G}, Sacrifice a land: Gashing Panther gains indestructible until end of turn. Tap it.

As this artifact enters, choose a creature type.
{T}: Put a muster counter on this artifact.
{T}: You may put a creature card of the chosen type with mana value equal to the number of muster counters on this artifact from your hand onto the battlefield.

You may play cards exiled with Azamir planeswalkers.
[+2]: Search each player's library for a card and exile it. Shuffle each library searched this way.
[–3]: Each opponent chooses a permanent they control for each permanent type, then exiles those permanents.
[–8]: Exile all cards your opponents own from outside the game. Until end of turn, you may cast spells without paying their mana costs and you may play cards exiled with Azamir planeswalkers.

Enchant creature
Enchanted creature gets -3/-3.

Deathtouch
{T}, Sacrifice another creature: Add two mana of any one color.

Target opponent reveals their hand. You choose a creature card from it and exile that card.
Ferocious — If you control a creature with power 4 or greater, instead choose a nonland card from their hand and exile that card.

First strike
Whenever an opponent casts a spell, Kiboshi's Guardian gains indestructible until end of turn.

Whenever Duskwatcher attacks, create a Function token with “Tap target creature.” (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)

Scry 3.
Catalyze. (The next spell you cast this turn costs {1} less to cast.)

You may put a +1/+1 counter on target creature you control. It deals damage equal to its power to another target creature or planeswalker.

(As an Encounter enters, choose an opponent to protect it. You and others can attack it. When defense counters are removed, create a 0/0 Army token if you don't control one, then put that many +1/+1 counters on a Army you control.)
When Settling of Soli enters, reveal the top four cards of your library. You may put a noncreature card from among them into your hand. Put the rest on the bottom of your library in any order.

Reach

{1}, {T}, Move a -1/-1 counter from another creature onto Dockside Healer: You gain 2 life.

Menace (This creature can't be blocked except by two or more creatures.)
Engage (This creature must be blocked each combat if able.)

Create a 1/1 blue Illusion creature token with “This gets +1/+1 for each other Illusion you control.”
Acquiesce (If you cast this spell from your hand, exile it as it resolves. When one or more creatures you control deal combat damage to an opponent, you may cast this card from exile without paying its mana cost.)

Defender
When Warden of Silence enters, draw a card.

Instant and sorcery spells you cast cost {1} less to cast.

Whenever you cast a noncreature spell, create a 1/1 colorless Construct artifact creature token.

Whenever an artifact or enchantment you control enters, target player mills two cards.

Enchant creature
Enchanted creature gets -X/-X, where X is the number of creature cards in your graveyard.