Rivals of Ixalan

Majestic Heliopterus | Creature | Dinosaur | Flying Whenever Majestic Heliopterus attacks, another target Dinosaur you control gains flying until end of turn. | Filip Burburan

Aquatic Incursion | Enchantment | | When Aquatic Incursion enters the battlefield, create two 1/1 blue Merfolk creature tokens with hexproof. (They can't be the targets of spells or abilities your opponents control.) {3}{U}: Target Merfolk can't be blocked this turn. | Jason Rainville

Riverwise Augur | Creature | Merfolk Wizard | When Riverwise Augur enters the battlefield, draw three cards, then put two cards from your hand on top of your library in any order. | Alayna Danner

Siren Reaver | Creature | Siren Pirate | Raid — This spell costs {1} less to cast if you attacked this turn. Flying | Tomasz Jedruszek

Pitiless Plunderer | Creature | Human Pirate | Whenever another creature you control dies, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.") | David Palumbo

Ravenous Chupacabra | Creature | Beast Horror | When Ravenous Chupacabra enters the battlefield, destroy target creature an opponent controls. | Daarken

Forerunner of the Empire | Creature | Human Soldier | When Forerunner of the Empire enters the battlefield, you may search your library for a Dinosaur card, reveal it, then shuffle and put that card on top. Whenever a Dinosaur enters the battlefield under your control, you may have Forerunner of the Empire deal 1 damage to each creature. | Dan Scott

Needletooth Raptor | Creature | Dinosaur | Enrage — Whenever Needletooth Raptor is dealt damage, it deals 5 damage to target creature an opponent controls. | Winona Nelson

Pirate's Pillage | Sorcery | | As an additional cost to cast this spell, discard a card. Draw two cards and create two Treasure tokens. (They're artifacts with "{T}, Sacrifice this artifact: Add one mana of any color.") | Wayne Reynolds

Cacophodon | Creature | Dinosaur | Enrage — Whenever Cacophodon is dealt damage, untap target permanent. | Johann Bodin

Forerunner of the Heralds | Creature | Merfolk Scout | When Forerunner of the Heralds enters the battlefield, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top. Whenever another Merfolk enters the battlefield under your control, put a +1/+1 counter on Forerunner of the Heralds. | Chris Seaman

Deadeye Brawler | Creature | Human Pirate | Deathtouch Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) Whenever Deadeye Brawler deals combat damage to a player, if you have the city's blessing, draw a card. | Jesper Ejsing

Dire Fleet Neckbreaker | Creature | Orc Pirate | Attacking Pirates you control get +2/+0. | Daarken

Raging Regisaur | Creature | Dinosaur | Whenever Raging Regisaur attacks, it deals 1 damage to any target. | Bayard Wu