Ixalan

Daring Saboteur | Creature | Human Pirate | {2}{U}: Daring Saboteur can't be blocked this turn. Whenever Daring Saboteur deals combat damage to a player, you may draw a card. If you do, discard a card. | Victor Adame Minguez

River Sneak | Creature | Merfolk Warrior | River Sneak can't be blocked. Whenever another Merfolk enters the battlefield under your control, River Sneak gets +1/+1 until end of turn. | Slawomir Maniak

Shaper Apprentice | Creature | Merfolk Wizard | Shaper Apprentice has flying as long as you control another Merfolk. | Yongjae Choi

Shipwreck Looter | Creature | Human Pirate | Raid — When Shipwreck Looter enters the battlefield, if you attacked this turn, you may draw a card. If you do, discard a card. | Wayne Reynolds

Storm Fleet Aerialist | Creature | Human Pirate | Flying Raid — Storm Fleet Aerialist enters the battlefield with a +1/+1 counter on it if you attacked this turn. | Jesper Ejsing