msem-instigator

When Baneblade Stalker enters, proliferate. (Choose any number of permanents and/or players with counters on them, then give each another counter of each kind already there.)

Crumbling Necropolis enters tapped.
{T}: Add {U}, {B}, or {R}.

{T}: Add one mana of any color.
{2}, {T}: Put a lore counter on a Saga you control.

Creatures you control have “{T}: Add {C}.”
Mirage {1}{U} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

[+2]: The Witch Queens deal 2 damage to each of up to two targets.
[–3]: Gain control of target land and untap it.
[–9]: Each player discards their hand, then draws up to seven cards. The Witch Queens deal damage to each opponent equal to twice the number of cards that player has drawn this turn.

Enchant creature
Enchanted creature gets +3/+0 and has menace.
Whenever enchanted creature deals combat damage to a player, discard a card, then draw a card.

Whenever you attack with one or more Pirates, create that many 1/1 white Bird creature tokens with flying that are tapped and attacking. At end of combat, choose one of those tokens, then exile the rest.

Flying
Whenever a creature you control phases in, it gains flying until end of turn.

Deathtouch

When Unbound Expanse enters, if an opponent controls more lands than you, create a Plains token. (It's a basic land with “{T}: Add {W}.”)
{3}{W}, Sacrifice Unbound Expanse: Exile each nonland permanent you control, then return those cards to the battlefield under your control. Activate only as a sorcery.

Mill three cards, then you may return a creature or land card from your graveyard to your hand.

Archive 3 (As this enters, shuffle the top three cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
Whenever you draw a card from the archived library, put the top card of your main library on the bottom of the archived library.
{B}: Exchange a card from the archived library with a card from your hand.

Wraith of the Fens gets +2/+2 as long as you've gained life this turn.

{T}: Add {C}.
{1}, {T}: Add {G}{U}.

When Transcended Explorer enters, if you control another enchantment, draw a card.

Other attacking Foxes you control get +1/+0.
{2}{R}, Sacrifice Jiu: Discard your hand, then draw a card for each tapped Fox you control.

First strike
When a creature you control scavenges Laiyru Huntsman, put a first strike counter on that creature.
Scavenge {2}{R} ({2}{R}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

Harmony — Draw a card, then discard a card.
Whenever Dramatic Artist attacks, harmonize. (Trigger up to one harmony of one permanent you control.)

Infiltrate (Whenever one or more attacking creatures you control aren't blocked, this creature gets +1/+1 until end of turn.)
Whenever Captain of the Exiled deals combat damage to a player, draw a card.

Primal {2}{R}{R} (During your turn, you may cast this spell for {2}{R}{R} instead of playing a land.)
Flying, prowess
At the beginning of your end step, if you didn't cast a spell this turn, sacrifice Thunderstride.

Tap target creature. It doesn't untap during its controllers next untap step.
Judge target creature you control. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

Equipped creature has “{T}: Put a charge counter on Flintlock Pistol.”
Whenever equipped creature attacks, remove a charge counter from Flintlock Pistol. When you do, equipped creature gets +3/+0 and gains first strike until end of turn.
Equip {1}

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

Spirited (When this creature enters, you may activate one of its activated abilities without paying its cost.)
{2}{R}{R}: If an instant or sorcery source you control would deal damage to a permanent or player this turn, it deals that much damage plus 2 instead.

Tap up to two target creatures.
Flashback {3}{W/U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)