msem-instigator

Counter target spell unless its controller pays {1}. If they do, draw a card.

Majestic Nauticorn has first strike as long as it's attacking.
Cycling {W} ({W}, Discard this card: Draw a card.)

Until end of turn, creatures you control have base power X/Y, where X is the greatest base power among creatures you control and Y is the greatest base toughness among creatures you control.
If you control a creature with flying, creatures you control gain flying until end of turn. The same is true for first strike, haste, lifelink, menace, prowess, trample, and vigilance.

As this permanent transforms into Ameret, Shining and Proud, counters on them become loyalty counters instead.
[+1]: Until end of turn, you may have Ameret become an X/X Angel creature with flying, indestructible, and haste, where X is the number of counters on them.
[–2]: Create three 1/1 red and white Cleric creature tokens with lifelink and haste.

{2}{R/G}: Wildershrine Warden gets +2/+2 until end of turn. You may have it assign its combat damage this turn as though it weren't blocked. Activate only once each turn.

Vigilance, deathtouch
Prevent all damage that would be dealt to Nataila, Raven's Repented while it's attacking or blocking alone.

This spell costs {1} less to cast and has flash as long as there are four or more card types among cards in your graveyard.
Draw two cards.

[0]: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
[–2]: Exile target creature. Create a battle token with three defense and “When this battle leaves the battlefield, return the exiled card to the battlefield under its owner's control.” You're protecting it.
[–5]: Create two 0/0 black Phyrexian Germ creature tokens, then put two +1/+1 counters on each creature you control.

[+1]: Each player discards a card or sacrifices a creature.
[–3]: Vikalden deals X damage to any target and you gain X life, where X is the number of Swamps you control.
[–5]: You get an emblem with “{B}, Pay 2 life: Draw a card.”

Flying
Whenever another creature you control enters, you gain 1 life.

Vigilance, reach
{T}: Splitshaft Deadeye deals damage equal to its power to target creature with flying.

Whenever Lone Freelancer becomes blocked, it deals damage equal to its power to defending player.

Torch Reveler gets +2/+0 as long as you control an artifact.

Enchant creature
As Legacy of Highpoint enters, choose a creature type.
Enchanted creature gets +2/+2, has flying, and is the chosen type in addition to its other types.

Pressure {2}{B} (You may cast this spell for its pressure cost if there are seven or more cards in your graveyard.)
Menace (This creature can't be blocked except by two or more creatures.)

Flying
Harmony — Until the end of your next turn, you may cast target instant or sorcery card from your graveyard. If that card would be put into your graveyard, exile it instead.
When Aven Acoustimancer enters, harmonize. (Trigger up to one harmony of one permanent you control.)

Exile target creature and all other creatures with the same name as that creature. Search its controller's graveyard, hand and library for any number of cards with the same name as that creature and exile them. Then that player shuffles. Exile Erase from Existence.

Another target player reveals their hand. You may choose an instant or sorcery card from it and cast it without paying its mana cost.
Fuse (You may cast one or both halves of this card from your hand.)

This spell costs {1} less to cast for each card you've discarded this turn.
Draw three cards.

Put target artifact or enchantment with mana value less than or equal to the number of basic lands you control on the bottom of its owner's library.

As Calamity Apparition enters, choose fade or linger.
When Calamity Apparition dies,
• Fade — You gain 2 life and scry 2.
• Linger — Put a +1/+1 counter on target creature you control.

When Evermind's Watch enters, conjure a card named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)
Once each turn, when you activate a loyalty ability, you may create a Function token with its effects. (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)

This spell costs {1} less to cast for each enchantment you control.
Destroy all creatures.

Flash
Whenever Operative POSH attacks or you cast a green or red spell, exile up to one target nontoken permanent. Return that card to the battlefield under its owner's control at the beginning of the next end step.

{4}, {T}, Exile Deathwind Detonator: Destroy all nonland permanents. Each player gets an emblem with “At the beginning of your upkeep, you lose 1 life.”