Ruin Raider

Raid — At the beginning of your end step, if you attacked this turn, reveal the top card of your library and put that card into your hand. You lose life equal to the card's mana value.

Siren Reaver

Raid — This spell costs {1} less to cast if you attacked this turn.
Flying

Riddlemaster Sphinx

Flying (This creature can't be blocked except by creatures with flying or reach.)
When this creature enters, you may return target creature an opponent controls to its owner's hand.

Hostage Taker

When this creature enters, exile another target creature or artifact until this creature leaves the battlefield. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that spell.

Swamp

Demonlord Belzenlok

Flying, trample
When Demonlord Belzenlok enters, exile cards from the top of your library until you exile a nonland card, then put that card into your hand. If the card's mana value is 4 or greater, repeat this process. Demonlord Belzenlok deals 1 damage to you for each card put into your hand this way.

Kitesail Corsair

This creature has flying as long as it's attacking.

Departed Deckhand

When this creature becomes the target of a spell, sacrifice it.
This creature can't be blocked except by Spirits.
{3}{U}: Another target creature you control can't be blocked this turn except by Spirits.

Ravenous Chupacabra

When this creature enters, destroy target creature an opponent controls.

Murder

Drowned Catacomb

This land enters tapped unless you control an Island or a Swamp.
{T}: Add {U} or {B}.

Submerged Boneyard

This land enters tapped.
{T}: Add {U} or {B}.

Exclusion Mage

When this creature enters, return target creature an opponent controls to its owner's hand.

Deadeye Rig-Hauler

Raid — When this creature enters, if you attacked this turn, you may return target creature to its owner's hand.

Grasping Scoundrel

This creature gets +1/+0 as long as it's attacking.

Chart a Course

Draw two cards. Then discard a card unless you attacked this turn.

Dire Fleet Poisoner

Flash
Deathtouch
When this creature enters, target attacking Pirate you control gets +1/+1 and gains deathtouch until end of turn.

Island

Fathom Fleet Boarder

When this creature enters, you lose 2 life unless you control another Pirate.

Kitesail Freebooter

Flying
When this creature enters, target opponent reveals their hand. You choose a noncreature, nonland card from it. Exile that card until this creature leaves the battlefield.

Dreamcaller Siren

Flash
Flying
This creature can block only creatures with flying.
When this creature enters, if you control another Pirate, tap up to two target nonland permanents.

Siren Stormtamer

Flying
{U}, Sacrifice this creature: Counter target spell or ability that targets you or a creature you control.