Ixalan

Deadeye Quartermaster | Creature | Human Pirate | When Deadeye Quartermaster enters the battlefield, you may search your library for an Equipment or Vehicle card, reveal it, put it into your hand, then shuffle. | Josh Hass

Dreamcaller Siren | Creature | Siren Pirate | Flash Flying Dreamcaller Siren can block only creatures with flying. When Dreamcaller Siren enters the battlefield, if you control another Pirate, tap up to two target nonland permanents. | Eric Deschamps

Headwater Sentries | Creature | Merfolk Warrior | | Naomi Baker

Herald of Secret Streams | Creature | Merfolk Warrior | Creatures you control with +1/+1 counters on them can't be blocked. | Sara Winters

Pirate's Prize | Sorcery | | Draw two cards. Create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.") | Deruchenko Alexander

Run Aground | Instant | | Put target artifact or creature on top of its owner's library. | Sara Winters

Storm Sculptor | Creature | Merfolk Wizard | Storm Sculptor can't be blocked. When Storm Sculptor enters the battlefield, return a creature you control to its owner's hand. | Sidharth Chaturvedi

Tempest Caller | Creature | Merfolk Wizard | When Tempest Caller enters the battlefield, tap all creatures target opponent controls. | Ryan Alexander Lee

Hostage Taker | Creature | Human Pirate | When Hostage Taker enters the battlefield, exile another target creature or artifact until Hostage Taker leaves the battlefield. You may cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any type to cast that spell. | Wayne Reynolds

Marauding Looter | Creature | Human Pirate | Raid — At the beginning of your end step, if you attacked this turn, you may draw a card. If you do, discard a card. | Jason A. Engle

Admiral Beckett Brass | Legendary Creature | Human Pirate | Other Pirates you control get +1/+1. At the beginning of your end step, gain control of target nonland permanent controlled by a player who was dealt combat damage by three or more Pirates this turn. | Jason Rainville