msem-instigator

Reach, vigilance
When Amorphous Tyrant enters, another target creature you control deals damage equal to its power to target creature or planeswalker you don't control.
Evoke {G} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

Menace
When Scion of Calamities enters, exile the top two cards of your library. Until the end of your next turn, you may play one of those cards.
Whenever a Mountain you control enters, you may aetherize Scion of Calamities. (To aetherize, create a token that's a copy of it, then exile that token.)

Flying, menace
Whenever another creature you control deals combat damage to a player, sacrifice it.
If you would draw a card, you may instead return a creature card from your graveyard to your hand.

As The Mistake enters, choose a card name.
Activated abilities of sources with the chosen name can't be activated unless they're mana abilities.
Unveil {5} ({5}: Transform this. Unveil only as a sorcery.)

Trample
If a creature in Imperial Guardian's pack would deal damage to a permanent or player, it deals twice that much damage instead. (Two or more creatures you control with equal power are in a pack.)

Enchant creature
When Sticky Fingers enters, draw a card.
Enchanted creature gets +2/+0 and can't be blocked.

Choose two or four —
• Search your library for a Demon card, reveal it, put it into your hand, then shuffle. You lose life equal to its mana value.
• Sacrifice a creature. If you do, draw two cards.
• Each opponent loses 2 life and you gain 2 life.
• Conjure a card named Fatigue and put it on top of your library. (It's a colorless sorcery that costs {2} with “Draw a card.”)

Lifelink
Bulwark — Whenever Tharanos' Sentinel attacks, if you control a creature with toughness 4 or greater, untap it.

{2}{G}, Sacrifice Derrivan Beast Tracker: Create a 3/3 green Beast creature token.

When Zoetic Tomb enters, exile target creature.
{4}: Until end of turn, Zoetic Tomb becomes a Golem artifact creature with power and toughness equal to the exiled creature's base power and toughness.

For each color of mana spent to cast this spell, create a 0/2 green Egg creature token. (Then exile this card. You may cast the creature later from exile.)

Whenever you cast an instant or sorcery spell, copy it. You may choose new targets for the copy. Overclock deals X damage to you, where X is the number of spells you've cast this turn.

{2}{W}: Audacious Knight gains first strike and vigilance until end of turn. (It deals combat damage before creatures without first strike. Attacking does not cause it to tap.)

Flash
Flying
When this creature enters, it seeks valor. (Give it that Oath Aura. Fulfill it by it dealing combat damage to a player to create a 2/1 white Soldier token.)

At the beginning of your upkeep, draw a card, then discard a card.
{4}{U}: Tap target creature an opponent controls. It doesn't untap during its controller's next untap step.

Deathtouch

Target player mills three cards for each artifact you control.

Flying, trample
Prismatic — Whenever you cast a multicolored spell, put a +1/+1 counter on Azure Caterwauler.

{T}: Add {C}.
Crew 3 (Tap any number of creatures you control with total power 3 or greater: This Vehicle becomes an artifact creature until end of turn.)

When Caer Crann Warleader enters, distribute three +1/+1 counters among any number of creatures you control.
Embattled creatures you control have trample. (A creature is embattled if it has a counter on it or a permanent you control attached to it.)

Scoured Barrens enters tapped.
When Scoured Barrens enters, you gain 1 life.
{T}: Add {W} or {B}.

Venerated Beast can't be blocked by more than one creature.

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

Spined Spire enters tapped.
{T}: Add {U} or {R}.
{1}{U}{R}: Until end of turn, Spined Spire becomes a Lizard creature with menace in addition to its other types.
Scavenge {1}{U}{R}

Each player reveals the bottom six cards of their library. For each player, put up to one permanent card revealed this way onto the battlefield under your control.