Rivals of Ixalan

River Darter | Creature | Merfolk Warrior | River Darter can't be blocked by Dinosaurs. | Winona Nelson

Sailor of Means | Creature | Human Pirate | When Sailor of Means enters the battlefield, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.") | Ryan Pancoast

Slippery Scoundrel | Creature | Human Pirate | Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) As long as you have the city's blessing, Slippery Scoundrel has hexproof and can't be blocked. | Dan Scott

Resplendent Griffin | Creature | Griffin | Flying Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) Whenever Resplendent Griffin attacks, if you have the city's blessing, put a +1/+1 counter on it. | Sam Rowan

Protean Raider | Creature | Shapeshifter Pirate | Raid — If you attacked this turn, you may have Protean Raider enter the battlefield as a copy of any creature on the battlefield. | Izzy

Storm Fleet Sprinter | Creature | Human Pirate | Haste Storm Fleet Sprinter can't be blocked. | G-host Lee

Kumena, Tyrant of Orazca | Legendary Creature | Merfolk Shaman | Tap another untapped Merfolk you control: Kumena, Tyrant of Orazca can't be blocked this turn. Tap three untapped Merfolk you control: Draw a card. Tap five untapped Merfolk you control: Put a +1/+1 counter on each Merfolk you control. | Tyler Jacobson