Ixalan

Deeproot Waters | Enchantment | | Whenever you cast a Merfolk spell, create a 1/1 blue Merfolk creature token with hexproof. (A creature with hexproof can't be the target of spells or abilities your opponents control.) | Zezhou Chen

Lookout's Dispersal | Instant | | This spell costs {1} less to cast if you control a Pirate. Counter target spell unless its controller pays {4}. | Ryan Yee

Navigator's Ruin | Enchantment | | Raid — At the beginning of your end step, if you attacked this turn, target opponent mills four cards. | Zoltan Boros

Storm Fleet Spy | Creature | Human Pirate | Raid — When Storm Fleet Spy enters the battlefield, if you attacked this turn, draw a card. | Scott Murphy

Shapers of Nature | Creature | Merfolk Shaman | {3}{G}: Put a +1/+1 counter on target creature. {2}{U}, Remove a +1/+1 counter from a creature you control: Draw a card. | Chris Seaman