Raid — When Shipwreck Looter enters the battlefield, if you attacked this turn, you may draw a card. If you do, discard a card.

When Watertrap Weaver enters the battlefield, tap target creature an opponent controls. That creature doesn’t untap during its controller’s next untap step.

When Tempest Caller enters the battlefield, tap all creatures target opponent controls.

Storm Sculptor can’t be blocked.

When Storm Sculptor enters the battlefield, return a creature you control to its owner’s hand.

Exile target creature you control, then return that card to the battlefield under its owner’s control. If a Pirate was exiled this way, draw a card.

Flying

When Siren Lookout enters the battlefield, it explores. (Reveal the top card of your library. Put that card into your hand if it’s a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

{7}{U}, {T}, Sacrifice Shore Keeper: Draw three cards.

Shaper Apprentice has flying as long as you control another Merfolk.

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {R}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {U}.)

({T}: Add {W}.)

({T}: Add {U}.)