msem-instigator

At the beginning of combat on your turn, if you control six or more lands, put a +1/+1 counter on target creature you control.

Concord — At the beginning of combat on your turn, if there are four or more card types among permanents you control, Sturdyshell Hammerclaw gets +2/+1 and gains trample until end of turn.

First strike, vigilance
When Subnautical Legionnaire enters, choose artifact, enchantment, or Merfolk. Exile target nonland permanent you don't control until you control no permanents of the chosen type.

Pressure {3}{B}{G} (You may cast this spell for its pressure cost if seven or more cards are in your graveyard.)
When Sunken-Eye Angler enters, mill three cards. Then if it was cast for its pressure cost, you may return a creature card from your graveyard to the battlefield.

Haste
At the beginning of your end step, return Sunwatcher Aspirant to its owner's hand.

Menagerie — When Supply Hauler enters, if there are five or more creature types among creatures you control, you may search your library for an artifact card, reveal it, put it into your hand, then shuffle.

Target creature gains double strike and trample until end of turn. (Then exile this card. You may cast the creature later from exile.)

Haste
{T}, Discard a card: Flip a coin. If you win the flip, draw two cards. Otherwise, you may pay {R}. If you do, repeat this process.

Exile target spell or creature. For as long as it remains exiled, its controller may cast that card, and it costs {2} more to cast.

Whenever Swiftspear Ambusher and exactly one other creature attack, put a +1/+1 counter on target attacking creature.

Create two 1/1 black Rat Pirate creature tokens.
Whenever two or more creatures you control deal combat damage to a player, you may pay {2} and exile Take All You Can Carry from your graveyard. If you do, create two Treasure tokens.

Draw three cards.
Skip your next turn. If it's your turn, end the turn.

Creatures you control with flying get +1/+1.
At the beginning of combat on your turn, target creature you control soars. (Put a flying counter on it. If it already has flying, put a +1/+1 counter on it instead.)

Each creature you control has every creature type among other creatures you control in addition to their own.
Creatures you control get +1/+1 for each of their creature types.

You may pay {2}{B}{B} and tap an untapped Pirate you control rather than pay this spell's mana cost.
Target player draws three cards and loses 3 life.

You may play Tectonic Chateau from your graveyard as long as seven or more cards are in your graveyard.
Tectonic Chateau enters tapped.
{T}: Add {R} or {W}.
Cycling {1}{R}{W} ({1}{R}{W}, Discard this card: Draw a card.)

Choose one —
• Counter target spell unless its controller pays {4}.
• Tap up to two target creatures. They don't untap during their controller's next untap step.

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever the second card is put into your graveyard from anywhere each turn, add a quest counter.
You may sacrifice a creature. When you do, you may return target creature card from your graveyard to your hand.
Destroy target nonland permanent an opponent controls.

(Add a quest counter as this enters. Sacrifice after 3.)
At the beginning of your end step, if you have more cards in hand than an opponent, add a quest counter.
Target opponent exiles the top card of their library. You may play that card for as long as it remains exiled. (You still pay its costs.)
Create three Treasure tokens.

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you draw your second card each turn, add a quest counter.
Scry 3.
Create a blue and green enchantment token named The Heart with “Whenever you tap a land for mana, add one mana of any color.”

(Add a quest counter as this enters. Sacrifice after 3.)
At the beginning of your end step, if you cast two or more spells this turn, add a quest counter.
The Symphony of Leafdown deals 2 damage to any target. Draw a card.
Until the end of your next turn, instant and sorcery spells you cast cost {1} less to cast.

Reveal the cards in your library. Target opponent chooses three nonland cards with different names from it. You put the chosen cards into your hand. Then shuffle.

As an additional cost to cast this spell, discard a card.
Draw two cards.

Flash
Menagerie — When Tidal Trickster enters, if there are five or more creature types among creatures you control, you may search your library for a card named Tidal Trickster, reveal it, put it into your hand, then shuffle.