The Lost Caverns of Ixalan

Hermitic Nautilus | Artifact Creature | Nautilus | Vigilance {1}{U}: Hermitic Nautilus gets +3/-3 until end of turn. | Logan Feliciano

Malcolm, Alluring Scoundrel | Legendary Creature | Siren Pirate | Flash Flying Whenever Malcolm, Alluring Scoundrel deals combat damage to a player, put a chorus counter on it. Draw a card, then discard a card. If there are four or more chorus counters on Malcolm, you may cast the discarded card without paying its mana cost. | Fesbra

Oaken Siren | Artifact Creature | Siren Pirate | Flying, vigilance {T}: Add {U}. Spend this mana only to cast an artifact spell or activate an ability of an artifact source. | Lars Grant-West

River Herald Scout | Creature | Merfolk Scout | When River Herald Scout enters the battlefield, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.) | Josu Hernaiz

Shipwreck Sentry | Creature | Human Pirate | Defender As long as an artifact entered the battlefield under your control this turn, Shipwreck Sentry can attack as though it didn't have defender. | Ryan Valle

Staunch Crewmate | Creature | Human Pirate | When Staunch Crewmate enters the battlefield, look at the top four cards of your library. You may reveal an artifact or Pirate card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. | LA Draws

The Ancient One | Legendary Creature | Spirit God | Descend 8 — The Ancient One can't attack or block unless there are eight or more permanent cards in your graveyard. {2}{U}{B}: Draw a card, then discard a card. When you discard a card this way, target player mills cards equal to its mana value. | Victor Adame Minguez

Captain Storm, Cosmium Raider | Legendary Creature | Human Pirate | Whenever an artifact enters the battlefield under your control, put a +1/+1 counter on target Pirate you control. | Diego Gisbert

Saheeli, the Sun's Brilliance | Legendary Creature | Human Artificer | {U}{R}, {T}: Create a token that's a copy of another target creature or artifact you control, except it's an artifact in addition to its other types. It gains haste. Sacrifice it at the beginning of the next end step. | Cynthia Sheppard

Nicanzil, Current Conductor | Legendary Creature | Merfolk Scout | Whenever a creature you control explores a land card, you may put a land card from your hand onto the battlefield tapped. Whenever a creature you control explores a nonland card, put a +1/+1 counter on Nicanzil, Current Conductor. | Fariba Khamseh