msem-instigator

({T}: Add {R}.)
Derelict Amphitheatre enters tapped.
{R}, {T}, Reveal a red card from your hand: Scry 1.

When Bellani Mystic enters, target player mills two cards.

Art of war — At the beginning of your end step, if Sheraku Elite dealt damage to an opponent this turn, put a +1/+1 counter on it.

Flash
Spirited (When this creature enters, you may activate one of its activated abilities without paying its cost.)
{T}: Target creature gets +0/+4 until end of turn.

Destroy target artifact or enchantment. You gain 4 life.

When Voldaren Crypt-Guard enters, create a Weapon token. (It's an Equipment artifact with “Equipped creature gets +1/+1” and equip {2}.)

Choose a card in your graveyard. Search your library for a card with the same name as that card, reveal it, put it into your hand, then shuffle.

Lifelink
Prevent all combat damage that would be dealt to embattled creatures you control. (A creature is embattled if it has a counter on it or a permanent you control attached to it.)

Creatures you control gain lifelink until end of turn. If {W} was spent to cast Gorran Charge, creatures you control get +2/+2 until end of turn.

Blade of the Many can be attached only to a nonlegendary creature.
Equipped creature gets +2/+2.
Each other creature you own is a copy of equipped creature.
Effects that would cause permanents you own to become creatures cause them to become copies of equipped creature instead.
Equip {6}

Trample
While you're searching your library, if Shambling Manglers dealt combat damage to an opponent this turn, you may play lands from your library.

Put a +1/+1 counter on target creature. That creature gains flying until end of turn. Untap it.

When Ayala's Blessing enters, put a +1/+1 counter on up to two target creatures.
Whenever an embattled creature you control dies, you may return it to its owner's hand. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)

{T}: Add {G} or {U}.
{T}, Sacrifice Sigil of Creation: Add {G}{U}.

{T}: Add {C}.
{2}, {T}: Target creature gains haste until end of turn.

Scry 3, then reveal the top card of your library. Discard your hand, then draw cards equal to that card's mana value.

Counter target spell or activated ability. If an activated ability of an artifact was countered this way, put that permanent on the bottom of its owner's library.

Protection from spells
When Msuji Sureshot enters, search your library for an instant, sorcery, or Aura card that targets, reveal it, put it into your hand, then shuffle.

{1}{G}, Remove a -1/-1 counter from a creature you control: Wiltthorn Elemental gets +2/+2 until end of turn.

{T}: Add {C}.
{3}, {T}, Sacrifice Treasure Beach: Create three Treasure tokens. (They have “{T}, Sacrifice this artifact: Add one mana of any color.”)

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

{T}: Add {C}.
Satrapies you control have “{1}{W}, {T}, Exile a card from your graveyard: Create a 1/1 white Soldier creature token.”

When Deputy Gibem enters, post a bounty on each creature and each planeswalker. (Put a bounty counter on those permanents. Each of them have “When this permanent dies, each opponent draws a card” as long as it has a bounty counter on it.)

At the beginning of your upkeep, if there are three or more colors among creatures you control, you gain 2 life and draw a card.

Equipped creature gets +2/+2 and protection from black and from red.
Whenever equipped creature deals combat damage to a player, that player loses 3 life unless they discard a card or sacrifice a nonland permanent. You discard a card, then you draw two cards.
Equip {2}