msem-instigator

At the beginning of your upkeep, Suitor of the Sea deals 1 damage to each player.

{W}: Target creature gains vigilance until end of turn.

Flying
When Sunchaser Mantas enters the battlefield, choose a color. Look at the top four cards of your library. You may reveal a card of the chosen color from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Heretic (Whenever you cast a spell that doesn't share a color with this creature, it gets +1/+1 until end of turn.)
{1}{W}: You gain life equal to Sunken Outcast's power.

Primal {1}{W}{W} (During your turn, you may cast this spell for {1}{W}{W} instead of playing a land.)
Double strike
When Sunken Slasher enters the battlefield, if you didn't play a land this turn, put a +1/+1 counter on it.

Pressure {3}{B}{G} (You may cast this spell for its pressure cost if there are seven or more cards in your graveyard.)
When Sunken-Eye Angler enters the battlefield, 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
Heretic (Whenever you cast a spell that doesn't share a color with this creature, it gets +1/+1 until end of turn.)

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.

Haste
At the beginning of combat on your turn, target creature or Vehicle you control gets +2/+0 until end of turn.

When Syzygy Navigator enters the battlefield, exile target nonland card from an opponent's graveyard. Copy it. You may cast the copy. (You still pay its costs, including color. Copies of permanents enter the battlefield as tokens.)
Whenever you cast a spell from anywhere other than your hand, draw a card, then discard a card.

During each of your turns, you may cast a copy of a card in an opponent's graveyard by exiling that card in addition to its other costs. (Copies of permanents enter the battlefield as tokens.)

First mate—Your starting deck contains no more than eight cards of each nonland card type. (If this card outside the game is your chosen first mate, you may swap it with a card in your opening hand.)
Lifelink
At the beginning of your upkeep, you may pay 3 life. If you do, exile another target nonland permanent until Tabia leaves the battlefield. If you control another permanent that shares a card type with it, exile it instead.

Indestructible
If Tarraka-no-Oni would be put into a graveyard from anywhere, reveal Tarraka-no-Oni and shuffle it into its owner's library instead.

Flying
When Tempest Stormcaster enters the battlefield, if a permanent you control left the battlefield this turn, you may have target player draw a card.

When you unveil Tempest Termagant, you may put target land on top of its owner's library.

Flying
{T}: Target land you control becomes the basic land type of your choice until end of turn.

Protection from nonblue
Whenever Terror of Palta Gorge attacks, exile another target nonblue creature until Terror of Palta Gorge leaves the battlefield.

When Terror of the Ontarachie enters the battlefield, choose one —
• Each player sacrifices a creature.
• Each player loses 5 life.

Heroic — Whenever you cast a spell that targets Thassa's Shoreguards, tap target creature an opponent controls. It doesn't untap during its controller's next untap step.
Whenever Thassa's Shoreguards deals combat damage to a player, draw a card.

{5}{U}{U}: Thassa's Tidebringer can't be blocked this turn. This ability costs {1} less to activate for each creature you control with a counter on it.

Menace
When The Anguilahydra enters the battlefield, draw X cards and put X +1/+1 counters on The Anguilahydra, where X is the number of enchantments you control.

Flying
Spirited (When this creature enters the battlefield, you may activate one of its activated abilities without paying its costs.)
Harmony — Draw three cards.
{2}{G}{G}: Harmonize. (Trigger up to one harmony of a permanent you control.)

Enspirit (As you cast this spell, you may exile a nonenchantment creature you control until this leaves the battlefield or fails to resolve. Reduce this spell's cost by the exiled card's mana value.)
At the beginning of your upkeep, create a token that's a copy of the enspirited card. It gains haste until end of turn. Exile it at the beginning of the next end step.

When Theurgist of the Depths enters the battlefield, for each card type, you may exile a card of that type from your graveyard. Target opponent separates those cards into two piles. Put all cards from the pile of your choice into your hand.
Recite {B}{G}{U} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters the battlefield or if it would leave the battlefield.)

Whenever a creature you control phases in, it gets +2/+2 until end of turn.