Rivals of Ixalan

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

Silvergill Adept | Creature | Merfolk Wizard | As an additional cost to cast this spell, reveal a Merfolk card from your hand or pay {3}. When Silvergill Adept enters the battlefield, draw a card. | Magali Villeneuve

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

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

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

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

Merfolk Mistbinder | Creature | Merfolk Shaman | Other Merfolk you control get +1/+1. | Clint Cearley