msem-instigator

Menace
Whenever a creature blocks, put a -1/-1 counter on that creature at end of combat.
Creatures with -1/-1 counters on them can't block.

Menace
Whenever Algrin's Legacy becomes the target of a spell an opponent controls, that spell's controller loses 5 life unless they discard a card.

As long as you have 25 or more life, Alia's Enforcer gets +2/+2 and gains flying.
Whenever an artifact or enchantment you control enters, you gain 1 life.

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.”

[+1]: Create a 1/1 green Saproling creature token. You gain 2 life.
[0]: Creature spells you cast this turn can't be countered. As they enter, they gain hexproof until your next turn.
[–2]: Create a green enchantment token named Survival with “You and other permanents you control have ward {1}.”

Whenever you cast a noncreature spell, put a quest counter on Align the Astrolabe.
At the beginning of your upkeep, create a 1/1 colorless Construct artifact creature token for each three quest counters on Align the Astrolabe.

Flying
Whenever a creature enters under an opponent's control, you may pay {1}{B}. If you do, fateseal 1. (Look at the top one cards of an opponent's library, then put any number on the bottom and the rest on top in any order.)

Converge — Gain control of up to X target creatures with total mana value X or less, where X is the number of colors of mana spent to cast Alive and on Top.

Enchant player
At the beginning of enchanted player's upkeep, if they control two or more creatures and/or planeswalkers, they sacrifice a creature or planeswalker.

You may cast this spell without paying its mana cost if it targets a spell you control.
You may choose new targets for target spell.

Create two 2/1 black and red Cat Pirate creature tokens with menace. You lose 2 life.

Creatures you control gain vigilance until end of turn. After this main phase, there's an additional combat phase followed by an additional main phase.
Compose (Then if you cast this from your hand, exile it and create a Saga token with “r3—You may cast a copy of this card from exile without paying its mana cost.”)

Enchant creature
Enchanted creature gets +1/+1 for each artifact and/or enchantment you control.

Choose a number. Reveal that many cards from the top of your library and put them into your hand. You lose life equal to the total mana value of those cards.

If a creature would die this turn, exile it instead.
All-Consuming Fire deals 4 damage to each creature.

Destroy up to X target artifacts and/or enchantments. If X is 3 or more, you gain twice X life. If X is 6 or more, create two X/X Elemental creature tokens that are all colors.

[+1]: Until end of turn, All-Enduring Mafua becomes a 5/5 Cat Warrior creature with lifelink and indestructible. (He doesn't lose loyalty while he's not a planeswalker.)
[–2]: Exile target creature.
[–X]: Return each creature card with mana value X from your graveyard to your hand.

Whenever Almgrove Ambassador blocks or becomes blocked, you may untap target creature and remove it from combat.

First strike
Cadence (Whenever you cast a spell, if its mana value is greater than this creature's power, put a +1/+1 counter on this creature.)
Almgrove Champion can only attack or block alone.

When Almgrove Librarian enters, look at the top card of each of your libraries, then for each of those cards, put it on the top or bottom of one of your libraries.

Defender
Whenever you cast an instant or sorcery spell, you may untap Almgrove Sentinel.
{T}: Almgrove Sentinel deals 1 damage to any target.

Infamy 1 (Whenever this creature deals combat damage to a player, if it has no +1/+1 counters on it, put a +1/+1 counter on it and it becomes infamous.)
When Alpha Scout becomes infamous, create a 2/2 green Wolf creature token.

As Alratha, Pearl of the Sand Sea enters, you may have an opponent investigate. If you don't, it enters tapped.
{T}: Add {U}.
{1}{U}, {T}: Investigate.

First mate—At least half the cards in your starting deck are lands. (If this card outside the game is your chosen first mate, you may swap it with a card in your opening hand.)
Trample
{1}, Discard a land card: Put a +1/+1 counter on Alvarez. He deals 1 damage to any target.

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)
If a spell or ability would target you, it targets each player instead.
Whenever an opponent attacks you with one or more creatures, tap all noncreature permanents that player controls.