Whenever a creature you control enters, 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 the creature, then put the card back or put it into your graveyard.)
When Forerunner of the Coalition enters, you may search your library for a Pirate card, reveal it, then shuffle and put that card on top.Whenever another Pirate you control enters, each opponent loses 1 life.
Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.): Add ., : Draw a card. Activate only if you have the city's blessing.
First strikeWhen Dire Fleet Daredevil enters, exile target instant or sorcery card from an opponent's graveyard. You may cast it this turn, and mana of any type can be spent to cast that spell. If that spell would be put into a graveyard, exile it instead.
FlashWhen Swift Warden enters, target Merfolk you control gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)
When Forerunner of the Heralds enters, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top.Whenever another Merfolk you control enters, put a +1/+1 counter on Forerunner of the Heralds.
Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)At the beginning of your upkeep, each player draws a card. If you have the city's blessing, instead only you draw a card.
When Form of the Dinosaur enters, your life total becomes 15.At the beginning of your upkeep, Form of the Dinosaur deals 15 damage to target creature an opponent controls and that creature deals damage equal to its power to you.
When Aquatic Incursion enters, create two 1/1 blue Merfolk creature tokens with hexproof. (They can't be the targets of spells or abilities your opponents control.): Target Merfolk can't be blocked this turn.
Menace, Discard a card: Tomb Robber 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.)