msem-instigator

Damage dealt by Deepwater Stinger can't be prevented.

{B}{G}, {T}, Remove a -1/-1 counter from a creature you control: Create a 1/1 green Elf Druid creature token.

If Madame Beatrice would leave the battlefield, exile her instead.
Whenever one or more creatures you control deal combat damage to a player, that player reveals their hand. You may cast a card from their hand without paying its mana cost.

First strike
Whenever Martial Maestro attacks, other attacking creatures you control get +1/+0 until end of turn.

Whenever Student of the Coil attacks, target creature gains poisonous 1 until end of turn. (Whenever that creature deals combat damage to a player, that player gets a poison counter.)

Flying
Whenever you attack with three or more creatures, exile the top card of your library. You may play that card until you exile another card with Zarthane, Scourge of Galdurheim.
{2}{B/R}: Target creature gets +1/+0 and gains menace until end of turn. Activate only as a sorcery.

Flash
When Intrepid Shooter enters, it deals 2 damage to target attacking creature.

Look at the top seven cards of your library. Put two of them into your hand and the rest into your graveyard.

Enchant creature
Enchanted creature has flying and can only block creatures with flying.

As long as another creature you control is attacking, Prolific Thief can't be blocked.
Whenever Prolific Thief deals combat damage to a player, draw a card, then discard a card.

Enchant player
When Curse of the Vein enters, create a 1/1 black and red Vampire creature token with menace.
Whenever enchanted player is attacked, Curse of the Vein deals 1 damage to them.

Each player sacrifices a creature and discards a card.
Fuse (You may cast one or both halves of this card from your hand.)

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.

Flash (You may cast this spell any time you could cast an instant.)
{2}{G}: Luminescent Croaker gains indestructible until end of turn.

Surveil 2. When you do, destroy up to one target creature with power less than or equal to the number of card types among cards in your graveyard.

Create a 5/5 green Badger Bear creature token with trample. (Then exile this card. You may cast the creature later from exile.)

Concord — This spell costs {4} less to cast if there are four or more card types among permanents you control.
Vigilance, trample, lifelink, haste

Equipped creature gets +1/+1.
Whenever equipped creature attacks, tap up to one target creature.
Equip {1}

Call of the Abyss deals 3 damage to any target and you gain 3 life.

Flying
Whenever you cast your first noncreature spell each turn, create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

Target creature gets +2/+2 until end of turn. Untap it.

When Signet Ring enters, scry 1.
{2}, {T}, Sacrifice Signet Ring: Add two mana of different colors.

Vigilance, ward {1}
{T}: Add one mana of any color. If that mana is spent on a creature spell, it enters with an additional +1/+1 counter on it.

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.

Pressure {3}{U}{B} (You may cast this spell for its pressure cost if there are seven or more cards in your graveyard.)
Slipstream (This creature can't be blocked as long as only creatures with slipstream are attacking.)
{U}{B}, Reveal Cuxuri Beckoner from your hand: Target player mills two cards.