msem-instigator

If you've lost life this turn, you may cast this spell as though it had flash.
Return X target cards with different mana values from your graveyard to your hand. Put Studies Past on the bottom of its owner's library.

Lazhu, Whisperflame Seer enters with your choice of a trample or +1/+1 counter on him.
Whenever a creature in Lazhu's pack deals damage to a player or planeswalker, draw a card. (Two or more creatures you control with equal power are in a pack.)

Alpha (You may have this creature enter with a +1/+1 counter on it. If you do, it becomes alpha and can only attack alone.)
Ruthless Predator can't be blocked by more than one creature.

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, you exile up to one target creature. Return that card to the battlefield under its owner's control at the beginning of the next end step.

Whenever you gain life, amass Zombies 1. (Put a +1/+1 counter on an Army you control. It's also a Zombie. If you don't control one, create a 0/0 black Zombie Army creature token first.)
If you would gain life except for the first time each turn, instead each opponent loses 1 life. (If multiple sources would cause you to gain life at the same time, choose one to be first.)

Look at the top three cards of your library. Put one of those cards into your hand, one on top of your library, and one on the bottom of your library.

Whenever Fated Mariner attacks, forebode. (Create a tapped colorless Omen artifact token with “{T}, Discard a card, Sacrifice this artifact: Draw a card.”)
{1}{U}: Fated Mariner can't be blocked this turn.

Whenever Sledgesuit Prospector attacks, choose any number —
• Sacrifice an artifact. If you do, put a +1/+1 counter on Sledgesuit Prospector.
• Discard a card. If you do, create a Treasure token.

Speckled Outcast has menace as long as it's enchanted.

When Goblin Rocktosser enters, you may sacrifice a land. If you do, put a +1/+1 counter on Goblin Rocktosser.

Exile target instant or sorcery spell you control. Until end of turn, you may cast that card from exile without paying its mana cost. When you do, copy it. You may choose new targets for the copy.

Trial 4 (As you cast this spell, an opponent of your choice may pay 4 life. If they don't, they fail the trial.)
Create a 1/1 white Cleric creature token. If the trial was failed, create three of those tokens instead.

As long as you have more life than each opponent, prevent all combat damage that would be dealt to Alia, Bearer of Morning.
[+1]: You gain 4 life.
[–2]: Exile target tapped creature. Each player draws a card.
[–8]: You get an emblem with “{W}, Pay X life: Exile target creature with power X or less.”

Trample

{T}: Quill Sniper deals 1 damage to any target if it's an opponent or if you control a storied permanent. (Enchantments and legendary permanents are storied.)

As long as you control another creature with flying, Wild Skycub has flying.

Enchant creature
Enchanted creature gets +0/+2 and can block an additional creature each combat.

Flying
Creatures your opponents control get -1/-0.

Each other nontoken Elf and/or Warrior you control enters with an additional +1/+1 counter on it.
{G}{G}, {T}, Remove two +1/+1 counters from among creatures you control: Create two 1/1 green Elf Warrior creature tokens.

Flash
Enchant creature
Enchanted creature has base power and toughness 0/1 and loses all abilities and creature types.
{2}{U}: Return Fractured Persona to its owner's hand.

Target creature you control gains erratic until end of turn. You may have it fight another target creature. (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order.)

Exile the top five cards of your library. You may put a creature card from among them with mana value 2 or less onto the battlefield.

Bloodsand Gulch enters tapped unless you control another Desert.
{T}: Add {B} or {R}.

{2}, {T}: Choose a permanent you control. Reveal the top five cards of your library. You may merge one of those cards that shares a card type with the chosen permanent under it. It has those card's abilities. Put the rest on the bottom of your library in any order.

As an additional cost to cast this spell, discard a card and sacrifice a nonland permanent.
Draw three cards.