msem-instigator

Equipped creature gets +0/+4.
Equip {2}

Whenever a land you control enters, upgrade target creature. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Vigilance
• Trample

[+1]: Add {R} or {G}.
[–1]: Fatresya deals 2 damage to target creature. That creature can't block this turn.
[–5]: You get an emblem with “Creatures you control get +2/+2 and have haste and trample.”

Creatures you control gain trample until end of turn.
Draw a card.

Flash
When Turned by Fear enters, return up to one target creature to its owner's hand.
At the beginning of combat on your turn, up to one target creature gains menace until end of turn.

When Trench Breaker enters, put target creature on top of its owner's library.

Rattlecage Terror enters tapped.
{1}{B}: Return Rattlecage Terror from your graveyard to your hand. When you do, another target creature card with mana value 3 or less in your graveyard gains this activated ability until end of turn, except it costs {1} more to activate.

This spell costs {2} less to cast if you control an embattled creature. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)
Destroy target tapped creature.

Takumi's Headquarters enters tapped.
When Takumi's Headquarters enters, you may mill two cards.
{T}: Add {W} or {U}.

Whenever an enchantment you control enters, you may gain 2 life.
Whenever you gain life, reveal the top card of your library. If it's an enchantment card, put it into your hand.

Flying
Kai'Wej, the Desolate has indestructible as long as you control no other creatures.
{1}{B}{B}, Sacrifice two creatures: Return Kai'Wej from your graveyard to the battlefield tapped.

When Ninhasir's March enters, it deals 3 damage to any target.
{1}{R}{R}: Transform Ninhasir's March. Activate only if your fealty to Mountains is five or greater.

{2}{R}, Sacrifice an artifact or creature: It deals 2 damage to any target.

Enchant player
When Curse of Slaughter enters, it deals 4 damage to target creature or planeswalker enchanted player controls.
Creatures attacking enchanted player have trample.

Destroy target nonland permanent with mana value 3 or less. (Then exile this card. You may cast Irbek later from exile.)

At the beginning of your upkeep, return target creature card from your graveyard to the battlefield.

As an additional cost to cast this spell, exile two permanent cards from your graveyard.
You may cast Adiran Survivors from your graveyard.

Draw two cards, then discard two cards if it's a combat step.
Quickdraw {U} (When a creature you control blocks or becomes blocked, you may cast this spell for {U}.)

Each land is an Island in addition to its other land types.

Exile target creature. That creature's controller reveals cards from the top of their library until they reveal a creature card. That player puts that card onto the battlefield, then shuffles the rest into their library.

Create two tapped colorless land tokens named Far-Off Lands with “{T}: Add one mana of any color.” (Then exile this card. You may cast the creature later from exile.)

Enchant opponent
At the beginning of enchanted player's upkeep, exile up to two target cards from that player's graveyard. If two cards that share a type are exiled this way, you draw a card and you lose 1 life.

When Automated Blademaster enters, create a colorless Equipment artifact token named Sword with “Equipped creature gets +1/+1” and equip {1} and attach it to Automated Blademaster.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Prowess
Art of war — At the beginning of your end step, if Student of Shigure dealt damage to an opponent this turn, you may draw a card, then discard a card.