Whenever Merchant Raiders or another Pirate enters the battlefield under your control, tap up to one target creature. That creature doesn't untap during its controller's untap step for as long as you control Merchant Raiders.
Whenever another creature you control dies, you get an experience counter. At the beginning of your end step, choose target creature card in your graveyard. If that card's mana value is less than or equal to the number of experience counters you have, return it to the battlefield. Otherwise, put it into your hand.
When Merfolk Tunnel-Guide enters the battlefield, you get a three-time boon with "Whenever one or more Merfolk enter the battlefield under your control, target Merfolk creature you control explores."
Flying Whenever Merfolk Windrobber deals combat damage to a player, that player mills a card. Sacrifice Merfolk Windrobber: Draw a card. Activate only if an opponent has eight or more cards in their graveyard.
"The merfolk of the Pearl Trident have risen from the waves since the earliest days, at times allies to humans, other times enemies. Now their power is cresting again, and who can say which way the new tide will flow." —Kalis, Onean scholar
Tap an untapped nontoken artifact you control: Add {G}. Tap two untapped nontoken artifacts you control: Exile the top card of your library. You may play it this turn.
"Why fear artifice? Is it not also of this world?"
The unicorns of Sursi are a manifestation of Serra's joy and compassion. They frolic and dance like children, offering blessings to anyone they encounter.
When Mesmerizing Benthid enters the battlefield, create two 0/2 blue Illusion creature tokens with "Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step." Mesmerizing Benthid has hexproof as long as you control an Illusion.