msem-instigator

Parish Paragon gets +1/+1 for each creature you control.
All damage that would be dealt to other creatures you control not named Parish Paragon is dealt to Parish Paragon instead.

Strange Harbor enters tapped unless you have 15 or less life.
{T}: Add {U} or {R}.

As an additional cost to cast this spell, sacrifice a creature or pay {3}.
Destroy target creature with power 3 or less.

Carefree Performer can't be sacrificed.
You may exert Carefree Performer as it attacks. When you do, discard two cards, then draw two cards. (An exerted creature won't untap during your next untap step.)

Target player mills four cards.
Draw a card.

When Gold Farmer enters, create a Treasure token.

(Choose only one work as a sorcery to add its ability.)
When Juyu Offering Pool enters, reveal the top five 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.
{1}{U}: Scales of Shara
Whenever you cast a noncreature spell, put a +1/+1 counter on target creature you control.
{6}{U}{U}: Eye of Shojiro
Whenever you cast a noncreature spell, create an 8/8 blue Kraken creature token.

Whenever Sower of Virulent Thoughts attacks, you may return a creature you control to its owner's hand. If you do, put a +1/+1 counter on target creature you control.

Menace, haste
Other Centaurs you control get +1/+0.

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.

Whenever Marshback Knights becomes the target of a spell or ability an opponent controls, counter it unless they pay {3}.
{1}{U}: Marshback Knights gains flying until end of turn.

Flash
When Giver of Martoob enters, put a +1/+1 counter on each of up to two target creatures you control.

The second spell you cast each turn costs {2} less to cast.
Whenever you cast a spell, each opponent loses 1 life and you gain 1 life.

Flash
When Emissary of Dark Tides enters, you may return target noncreature spell or tapped creature to its owner's hand.

Dragon Queen's Den enters tapped.
{T}: Add {U}.
{U}, {T}: Scry 1. Activate only as a sorcery and only if you control a blue creature.

When Ralezza's Disciple enters, if you control an enchantment, you gain 3 life.

Trample
{3}{B}{G}, Discard two cards: Return Tammil and Sulei, the Guides and another target creature card from your graveyard to the battlefield tapped.

When Ornery Bull enters, return a creature you control to its owner's hand.

Sacrifice a creature: Two-Faced Aristocrat gains indestructible until end of turn.
Attain {4}{B} ({4}{B}: Transform this. Spend at least three colors of mana to activate this, and only as a sorcery.)

Whenever an artifact enters or leaves the battlefield under your control, you gain 1 life.

(Activate each submodule once as a sorcery. When this enters, activate one submodule for free.)
{2}{R}: Anarchy
Exile the top three cards of your library. You may cast an enchantment, instant, or sorcery spell exiled this way until the end of your next turn.
{2}{B}: Despair
Each cursed opponent sacrifices a creature.
{1}{B}{R}: Strife
Chaos Module gains “At the beginning of your end step, each cursed opponent loses life equal to the number of Curses attached to them.”

Other creatures you control get +1/+1.
As long as Nobility is in your graveyard and you control a white enchantment, creatures you control get +1/+1.

When Qulai enters, look at the top six cards of your library. You may reveal a Fox card from among them and put it into your hand. Put the rest on the bottom of your library in any order.
Sacrifice Qulai: Foxes you control gain hexproof and indestructible until end of turn.

Bjarndyr Bruiser gets +2/+2 as long as it's embattled. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)

Colossal 4—{8} (You may cast this for its colossal cost to have it enter with four +1/+1 counters; or pay {8} as a sorcery: Put four +1/+1 counters on it if it has none.)
Abilities you activate that aren't mana abilities cost {2} less to activate. This effect can't reduce the mana in that cost to less than one mana.