msem-instigator

Create a 3/3 green Beast creature token, then populate. (Create a token that's a copy of a creature token you control.)

When The Grand Plot enters, search your library for up to three Saga cards with different names with mana value X or less, exile them, then shuffle.
The Grand Plot has all chapter abilities of cards exiled with it.
At the beginning of your upkeep, you may put a lore counter on The Grand Plot. When you do, you may sacrifice it. If you do, draw a card.

Whenever Rustshell Mantis is dealt damage, put that many +1/+1 counters on it. (It must survive the damage to get the counters.)

{3}{W}{W}: Put a divinity counter on Paragon of Noon. It gains indestructible.
Whenever Paragon of Noon attacks, if it has a divinity counter on it, search your library for a creature card with mana value 1, put it onto the battlefield tapped and attacking, then shuffle.

Counter target spell.
Take an extra turn after this one.

At the beginning of your upkeep, you may pay {G}. If you do, you may put a +1/+1 counter on target creature you control and you gain 2 life.

First strike
Other Foxes you control get +1/+1.
Whenever a Fox you control becomes blocked, it deals 1 damage to each creature blocking it.

Put a +1/+1 counter on target creature. It gains indestructible until end of turn.

Flying, deathtouch
{2}{B}{B}, Exile Weku, Malignity Spirit from your graveyard with four pact counters on him: You draw four cards and you gain 4 life.
At the beginning of your upkeep, if Weku is exiled with a pact counter on him, remove a pact counter from him. Then if Weku has no pact counters on him, you lose the game.

Whenever you cast a spell that doesn't share a color with Feathered Warden, you may gain 1 life.

Menace
Whenever Hui Zhou, the Dark Visage perseveres, you may destroy another target legendary creature. (A creature perseveres when it survives damage.)

Kicker {2} (You may pay an additional {2} as you cast this spell.)
Reach (This creature can block creatures with flying.)
If Shadowcreep was kicked, it enters with two +1/+1 counters on it.

Scry X. (Then exile this card. You may cast the creature later from exile.)

Love Letters enters with X stamp counters on it.
Whenever one or more creatures you control deal combat damage to a player, you may remove a stamp counter from Love Letters. If you do, draw a card.

Laiyru Shrine enters tapped.
{T}: Add {G} or {U}.
{G/U}, {T}, Sacrifice Laiyru Shrine: Put a +1/+1 counter on target creature you control. Activate only as a sorcery.

Flying

When Traversing the Hellwastes enters, create a 1/1 green Scout creature token. It gains haste until end of turn.
Whenever a creature you control enters, you may pay 2 life. If you do, draw a card.

At the beginning of combat on your turn, create a 1/1 red Cleric creature token with haste.
At the beginning of your end step, sacrifice each Cleric token you control unless you've cast an instant or sorcery spell this turn.

[+1]: Draw two cards, then put a card from your hand on the bottom of your library unless you've spent {W}{U}{B}{R}{G} on spells this turn.
[–2]: Add {W}{U}{B}{R}{G}.
[–6]: For each card type, you may return a card of that type from your graveyard to your hand.

Whenever equipped creature deals combat damage, you may return target creature card with mana value X or less from your graveyard to the battlefield, where X is the amount of damage dealt this way.
Equip {1}

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Trample
Seasoned Adventurer enters with two +1/+1 counters if you control seven or more lands.

Virtuoso's Parlor enters tapped.
When Virtuoso's Parlor enters, look at the top card of your library. You may put it into your graveyard.
{T}: Add {W} or {B}.

Whenever you scry, put a +1/+1 counter on Dunesea Cartographer for each card you looked at while scrying this way.
{3}{W}{U}: Scry 2.

Encourage ({T}: Another target creature you control gets +1/+1 until end of turn. Encourage only as a sorcery.)
Whenever Topan Curemaster encourages a creature, you gain 1 life.